step by step教你常用JS方法封装(一) [ 大杂烩 ]

# 前端 2024-05-05 14:48 0 47 来源：云博客

本文参考原文-http://bjbsair.com/2020-03-25/tech-info/6338/

持续更新中...

常用JS方法封装方法预告：

项目常用JS方法封装(二) [ 时间处理 ]
项目常用JS方法封装(三) [ 字符串相关处理 ]
项目常用JS方法封装(四) [ 数组相关处理 ]

使用方法非常简单，只需放到你的 utils.js 工具文件中，直接 export const 加上我的封装方法，在别的文件中使用{方法1,方法2,方法3...}引用后就可以直接使用了!

001.输入一个值,返回其数据类型

type = para => { return Object.prototype.toString.call(para).slice(8,-1) } 复制代码

002.阶乘

factorial = num => { let count = 1; for (let i = 1; i <= num; i++) { count *= i; } return count; } 复制代码

003.两个数之间累乘

multBetride = (x, y) => { let count; if (x < y) { count = x; for (let i = x + 1; i <= y; i++) { count *= i; } return count; } else { count = y; for (let i = y + 1; i <= x; i++) { count *= i; } return count; } } 复制代码

004.累加

（）里面可以放N个实参

function cumsum() { let sum = 0; for (let i = 0; i < arguments.length; i++) { sum += arguments[i]; } return sum; } 复制代码

005.计时器(计算代码块(函数)执行时间)

无参 computeTime(f)

computeTime = code => { let startTime = new Date().getTime(); code(); let endTime = new Date().getTime(); let time = endTime - startTime; return time; } 复制代码

有参 computeTime(f) 使用方法:computeTime(f,参数1,参数2......)

computeTime = f => { let startTime = new Date().getTime(); let p = []; for (let i = 1; i < arguments.length; i++) { p.push(arguments[i]) } f.apply(null, p) let endTime = new Date().getTime(); let Time = endTime - startTime; return Time; } 复制代码

006.数字超过9显示省略号

num_filter = val =>{ val = val?val-0:0; if (val > 9 ) { return "…" }else{ return val; } } 复制代码

007.数字超过99显示99+

ninenum_filter = val =>{ val = val?val-0:0; if (val > 99 ) { return "99+" }else{ return val; } } 复制代码

008.银行卡号分割

bank_filter = val =>{ val += ‘‘; val = val.replace(/(\s)/g,‘‘).replace(/(\d{4})/g,‘$1 ‘).replace(/\s*$/,‘‘); return val; } 复制代码

009.防抖与节流

/** * 函数防抖 (只执行最后一次点击) */ Debounce = (fn, t) => { let delay = t || 500; let timer; return function () { let args = arguments; if(timer){ clearTimeout(timer); } timer = setTimeout(() => { timer = null; fn.apply(this, args); }, delay); } }; /* * 函数节流 */ Throttle = (fn, t) => { let last; let timer; let interval = t || 500; return function () { let args = arguments; let now = +new Date(); if (last && now - last < interval) { clearTimeout(timer); timer = setTimeout(() => { last = now; fn.apply(this, args); }, interval); } else { last = now; fn.apply(this, args); } } }; 复制代码

010.深拷贝

deepClone = source => { const targetObj = source.constructor === Array ? [] : {}; // 判断复制的目标是数组还是对象 for (let keys in source) { // 遍历目标 if (source.hasOwnProperty(keys)) { if (source[keys] && typeof source[keys] === ‘object‘) { // 如果值是对象，就递归一下 targetObj[keys] = source[keys].constructor === Array ? [] : {}; targetObj[keys] = deepClone(source[keys]); } else { // 如果不是，就直接赋值 targetObj[keys] = source[keys]; } } } return targetObj; } let str1 = { arr: [1, 2, 3], obj: { key: ‘value‘ }, fn: function () { return 1; } }; let str3 = deepClone(str1); console.log(str3 === str1); // false console.log(str3.obj === str1.obj); // false console.log(str3.fn === str1.fn); // true 复制代码

011.获取视口尺寸

需要在HTML文件中运行

function getViewportOffset() { if (window.innerWidth) { return { w: window.innerWidth, h: window.innerHeight } } else { // ie8及其以下 if (document.compatMode === "BackCompat") { // 怪异模式 return { w: document.body.clientWidth, h: document.body.clientHeight } } else { // 标准模式 return { w: document.documentElement.clientWidth, h: document.documentElement.clientHeight } } } } 复制代码

012.数字前补零

/** * num为你想要进行填充的数字 * length为你想要的数字长度 */ //迭代方式实现 padding1=(num, length)=> { for(let len = (num + "").length; len < length; len = num.length) { num = "0" + num; } return num; } //递归方式实现 padding2=(num, length) =>{ if((num + "").length >= length) { return num; } return padding2("0" + num, length) } //转为小数 padding3=(num, length)=> { let decimal = num / Math.pow(10, length); //toFixed指定保留几位小数 decimal = decimal.toFixed(length) + ""; return decimal.substr(decimal.indexOf(".")+1); } //填充截取法 padding4=(num, length)=> { //这里用slice和substr均可 return (Array(length).join("0") + num).slice(-length); } //填充截取法 padding5=(num, length)=> { let len = (num + "").length; let diff = length+1 - len; if(diff > 0) { return Array(diff).join("0") + num; } return num; } 复制代码

013.格式转换：base64转file

/** * base64 base64 * filename 转换后的文件名 */ base64ToFile = (base64, filename )=> { let arr = base64.split(‘,‘) let mime = arr[0].match(/难过.*?);/)[1] let suffix = mime.split(‘/‘)[1] // 图片后缀 let bstr = atob(arr[1]) let n = bstr.length let u8arr = new Uint8Array(n) while (n--) { u8arr[n] = bstr.charCodeAt(n) } return new File([u8arr], `${filename}.${suffix}`, { type: mime }) } 复制代码

014.格式转换：base64转blob

base64ToBlob = base64 => { let arr = base64.split(‘,‘), mime = arr[0].match(/:(.*?);/)[1], bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n); while (n--) { u8arr[n] = bstr.charCodeAt(n); } return new Blob([u8arr], { type: mime }); }; 复制代码

015.格式转换：blob转file

blobToFile = (blob, fileName) => { blob.lastModifiedDate = new Date(); blob.name = fileName; return blob; }; 复制代码

016.格式转换：file转base64

/** * file 图片文件 * 返回图片的Base64数据 */ fileToBase64 = file => { let reader = new FileReader(); reader.readAsDataURL(file); reader.onload = function (e) { return e.target.result }; } 复制代码

017.获取地址栏传递过来的参数

/** * name为地址栏传递过来的字段名 */ getQueryString = name => { let reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)"); let r = window.location.search.substr(1).match(reg); if (r != null) return unescape(r[2]); return null; } // 测试 // http://localhost:3306/admin?id=111&name=xxx // console.log(getQueryString(‘id‘)); // 111 // console.log(getQueryString(‘name‘)); // xxx 复制代码

018.对象处理为数组对象

/** * obj 需要处理的对象 */ objToArrObj = obj => { let arr = [] for(let i in obj){ arr.push({[i]:obj[i]}) } return arr } // 测试数据 let obj = {20180410: 5, 20180411: 13, 20180412: 26, 20180413: 16} console.log(objToArrObj(obj)); /* [ { 20180410: 5 }, { 20180411: 13 }, { 20180412: 26 }, { 20180413: 16 } ] */```本文参考原文-http://bjbsair.com/2020-03-25/tech-info/6338/ ![手把手教你常用JS方法封装(一) [ 大杂烩 ]](http://p3.pstatp.com/large/dfic-imagehandler/a3548031-8354-4d74-a3c5-dd39f97e2390) 持续更新中...========常用JS方法封装方法预告：* 项目常用JS方法封装(二) [ 时间处理 ]* 项目常用JS方法封装(三) [ 字符串相关处理 ]* 项目常用JS方法封装(四) [ 数组相关处理 ]* * ***使用方法非常简单，只需放到你的 utils.js 工具文件中，直接 export const 加上我的封装方法，在别的文件中使用{方法1,方法2,方法3...}引用后就可以直接使用了!**001.输入一个值,返回其数据类型=================

type = para => {
return Object.prototype.toString.call(para).slice(8,-1)
}
复制代码

002.阶乘======

factorial = num => {
let count = 1;
for (let i = 1; i <= num; i++) {
count *= i;
}
return count;
}
复制代码

003.两个数之间累乘===========

multBetride = (x, y) => {
let count;
if (x < y) {
count = x;
for (let i = x + 1; i <= y; i++) {
count *= i;
}
return count;
} else {
count = y;
for (let i = y + 1; i <= x; i++) {
count *= i;
}
return count;
}
}
复制代码

004.累加======（）里面可以放N个实参

function cumsum() {
let sum = 0;
for (let i = 0; i < arguments.length; i++) {
sum += arguments[i];
}
return sum;
}
复制代码

005.计时器(计算代码块(函数)执行时间)======================**无参 computeTime(f)**

computeTime = code => {
let startTime = new Date().getTime();
code();
let endTime = new Date().getTime();
let time = endTime - startTime;
return time;
}
复制代码

**有参 computeTime(f)** 使用方法:computeTime(f,参数1,参数2......)

computeTime = f => {
let startTime = new Date().getTime();
let p = [];
for (let i = 1; i < arguments.length; i++) {
p.push(arguments[i])
}
f.apply(null, p)
let endTime = new Date().getTime();
let Time = endTime - startTime;
return Time;
}
复制代码

006.数字超过9显示省略号==============

num_filter = val =>{
val = val?val-0:0;
if (val > 9 ) {
return "…"
}else{
return val;
}
}
复制代码

007.数字超过99显示99+===============

ninenum_filter = val =>{
val = val?val-0:0;
if (val > 99 ) {
return "99+"
}else{
return val;
}
}
复制代码

008.银行卡号分割==========

bank_filter = val =>{
val += ‘‘;
val = val.replace(/(\s)/g,‘‘).replace(/(\d{4})/g,‘$1 ‘).replace(/\s*$/,‘‘);
return val;
}
复制代码

009.防抖与节流=========

/**

函数防抖 (只执行最后一次点击)
/
Debounce = (fn, t) => {
let delay = t || 500;
let timer;
return function () {
let args = arguments;
if(timer){
clearTimeout(timer);
}
timer = setTimeout(() => {
timer = null;
fn.apply(this, args);
}, delay);
}
};
/
函数节流
*/
Throttle = (fn, t) => {
let last;
let timer;
let interval = t || 500;
return function () {
let args = arguments;
let now = +new Date();
if (last && now - last < interval) {
clearTimeout(timer);
timer = setTimeout(() => {
last = now;
fn.apply(this, args);
}, interval);
} else {
last = now;
fn.apply(this, args);
}
}
};

复制代码

010.深拷贝=======

deepClone = source => {
const targetObj = source.constructor === Array ? [] : {}; // 判断复制的目标是数组还是对象
for (let keys in source) { // 遍历目标
if (source.hasOwnProperty(keys)) {
if (source[keys] && typeof source[keys] === ‘object‘) { // 如果值是对象，就递归一下
targetObj[keys] = source[keys].constructor === Array ? [] : {};
targetObj[keys] = deepClone(source[keys]);
} else { // 如果不是，就直接赋值
targetObj[keys] = source[keys];
}
}
}
return targetObj;
}

let str1 = {
arr: [1, 2, 3],
obj: {
key: ‘value‘
},
fn: function () {
return 1;
}
};
let str3 = deepClone(str1);

console.log(str3 === str1); // false
console.log(str3.obj === str1.obj); // false
console.log(str3.fn === str1.fn); // true
复制代码

011.获取视口尺寸==========**需要在HTML文件中运行**

function getViewportOffset() {
if (window.innerWidth) {
return {
w: window.innerWidth,
h: window.innerHeight
}
} else {
// ie8及其以下
if (document.compatMode === "BackCompat") {
// 怪异模式
return {
w: document.body.clientWidth,
h: document.body.clientHeight
}
} else {
// 标准模式
return {
w: document.documentElement.clientWidth,
h: document.documentElement.clientHeight
}
}
}
}
复制代码

012.数字前补零=========

/**

num为你想要进行填充的数字
length为你想要的数字长度
*/

//迭代方式实现
padding1=(num, length)=> {
for(let len = (num + "").length; len < length; len = num.length) {
num = "0" + num;
}
return num;
}

//递归方式实现
padding2=(num, length) =>{
if((num + "").length >= length) {
return num;
}
return padding2("0" + num, length)
}

//转为小数
padding3=(num, length)=> {
let decimal = num / Math.pow(10, length);
//toFixed指定保留几位小数
decimal = decimal.toFixed(length) + "";
return decimal.substr(decimal.indexOf(".")+1);
}

//填充截取法
padding4=(num, length)=> {
//这里用slice和substr均可
return (Array(length).join("0") + num).slice(-length);
}

//填充截取法
padding5=(num, length)=> {
let len = (num + "").length;
let diff = length+1 - len;
if(diff > 0) {
return Array(diff).join("0") + num;
}
return num;
}
复制代码

013.格式转换：base64转file====================

/**

base64 base64
filename 转换后的文件名
/
base64ToFile = (base64, filename )=> {
let arr = base64.split(‘,‘)
let mime = arr[0].match(/难过.?);/)[1]
let suffix = mime.split(‘/‘)[1] // 图片后缀
let bstr = atob(arr[1])
let n = bstr.length
let u8arr = new Uint8Array(n)
while (n--) {
u8arr[n] = bstr.charCodeAt(n)
}
return new File([u8arr], ${filename}.${suffix}, { type: mime })
}
复制代码

014.格式转换：base64转blob====================

base64ToBlob = base64 => {
let arr = base64.split(‘,‘),
mime = arr[0].match(/??.*?);/)[1],
bstr = atob(arr[1]),
n = bstr.length,
u8arr = new Uint8Array(n);
while (n--) {
u8arr[n] = bstr.charCodeAt(n);
}
return new Blob([u8arr], { type: mime });
};
复制代码

015.格式转换：blob转file==================

blobToFile = (blob, fileName) => {
blob.lastModifiedDate = new Date();
blob.name = fileName;
return blob;
};
复制代码

016.格式转换：file转base64====================

/**

file 图片文件
返回图片的Base64数据
*/
fileToBase64 = file => {
let reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (e) {
return e.target.result
};
}
复制代码

017.获取地址栏传递过来的参数================

/**

name为地址栏传递过来的字段名
/
getQueryString = name => {
let reg = new RegExp("(^|&)" + name + "=([^&])(&|$)");
let r = window.location.search.substr(1).match(reg);
if (r != null) return unescape(r[2]); return null;
}

// 测试
// http://localhost:3306/admin?id=111&name=xxx
// console.log(getQueryString(‘id‘)); // 111
// console.log(getQueryString(‘name‘)); // xxx
复制代码

018.对象处理为数组对象=============

/**

obj 需要处理的对象
*/
objToArrObj = obj => {
let arr = []
for(let i in obj){
arr.push({[i]:obj[i]})
}
return arr
}

// 测试数据
let obj = {20180410: 5, 20180411: 13, 20180412: 26, 20180413: 16}
console.log(objToArrObj(obj));
/*
[
{ 20180410: 5 },
{ 20180411: 13 },
{ 20180412: 26 },
{ 20180413: 16 }
]
*/

 ![手把手教你常用JS方法封装(一) [ 大杂烩 ]](http://p3.pstatp.com/large/dfic-imagehandler/a3548031-8354-4d74-a3c5-dd39f97e2390) 持续更新中...========常用JS方法封装方法预告：* 项目常用JS方法封装(二) [ 时间处理 ]* 项目常用JS方法封装(三) [ 字符串相关处理 ]* 项目常用JS方法封装(四) [ 数组相关处理 ]* * ***使用方法非常简单，只需放到你的 utils.js 工具文件中，直接 export const 加上我的封装方法，在别的文件中使用{方法1,方法2,方法3...}引用后就可以直接使用了!**001.输入一个值,返回其数据类型=================

type = para => {
return Object.prototype.toString.call(para).slice(8,-1)
}
复制代码

002.阶乘======

factorial = num => {
let count = 1;
for (let i = 1; i <= num; i++) {
count *= i;
}
return count;
}
复制代码

003.两个数之间累乘===========

004.累加======（）里面可以放N个实参

function cumsum() {
let sum = 0;
for (let i = 0; i < arguments.length; i++) {
sum += arguments[i];
}
return sum;
}
复制代码

005.计时器(计算代码块(函数)执行时间)======================**无参 computeTime(f)**

computeTime = code => {
let startTime = new Date().getTime();
code();
let endTime = new Date().getTime();
let time = endTime - startTime;
return time;
}
复制代码

**有参 computeTime(f)** 使用方法:computeTime(f,参数1,参数2......)

006.数字超过9显示省略号==============

num_filter = val =>{
val = val?val-0:0;
if (val > 9 ) {
return "…"
}else{
return val;
}
}
复制代码

007.数字超过99显示99+===============

ninenum_filter = val =>{
val = val?val-0:0;
if (val > 99 ) {
return "99+"
}else{
return val;
}
}
复制代码

008.银行卡号分割==========

bank_filter = val =>{
val += ‘‘;
val = val.replace(/(\s)/g,‘‘).replace(/(\d{4})/g,‘$1 ‘).replace(/\s*$/,‘‘);
return val;
}
复制代码

009.防抖与节流=========

/**

函数防抖 (只执行最后一次点击)
/
Debounce = (fn, t) => {
let delay = t || 500;
let timer;
return function () {
let args = arguments;
if(timer){
clearTimeout(timer);
}
timer = setTimeout(() => {
timer = null;
fn.apply(this, args);
}, delay);
}
};
/
函数节流
*/
Throttle = (fn, t) => {
let last;
let timer;
let interval = t || 500;
return function () {
let args = arguments;
let now = +new Date();
if (last && now - last < interval) {
clearTimeout(timer);
timer = setTimeout(() => {
last = now;
fn.apply(this, args);
}, interval);
} else {
last = now;
fn.apply(this, args);
}
}
};

复制代码

010.深拷贝=======

let str1 = {
arr: [1, 2, 3],
obj: {
key: ‘value‘
},
fn: function () {
return 1;
}
};
let str3 = deepClone(str1);

console.log(str3 === str1); // false
console.log(str3.obj === str1.obj); // false
console.log(str3.fn === str1.fn); // true
复制代码

011.获取视口尺寸==========**需要在HTML文件中运行**

012.数字前补零=========

/**

num为你想要进行填充的数字
length为你想要的数字长度
*/

//迭代方式实现
padding1=(num, length)=> {
for(let len = (num + "").length; len < length; len = num.length) {
num = "0" + num;
}
return num;
}

//递归方式实现
padding2=(num, length) =>{
if((num + "").length >= length) {
return num;
}
return padding2("0" + num, length)
}

//填充截取法
padding4=(num, length)=> {
//这里用slice和substr均可
return (Array(length).join("0") + num).slice(-length);
}

//填充截取法
padding5=(num, length)=> {
let len = (num + "").length;
let diff = length+1 - len;
if(diff > 0) {
return Array(diff).join("0") + num;
}
return num;
}
复制代码

013.格式转换：base64转file====================

/**

base64 base64
filename 转换后的文件名
/
base64ToFile = (base64, filename )=> {
let arr = base64.split(‘,‘)
let mime = arr[0].match(/难过.?);/)[1]
let suffix = mime.split(‘/‘)[1] // 图片后缀
let bstr = atob(arr[1])
let n = bstr.length
let u8arr = new Uint8Array(n)
while (n--) {
u8arr[n] = bstr.charCodeAt(n)
}
return new File([u8arr], ${filename}.${suffix}, { type: mime })
}
复制代码

014.格式转换：base64转blob====================

015.格式转换：blob转file==================

blobToFile = (blob, fileName) => {
blob.lastModifiedDate = new Date();
blob.name = fileName;
return blob;
};
复制代码

016.格式转换：file转base64====================

/**

file 图片文件
返回图片的Base64数据
*/
fileToBase64 = file => {
let reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (e) {
return e.target.result
};
}
复制代码

017.获取地址栏传递过来的参数================

/**

name为地址栏传递过来的字段名
/
getQueryString = name => {
let reg = new RegExp("(^|&)" + name + "=([^&])(&|$)");
let r = window.location.search.substr(1).match(reg);
if (r != null) return unescape(r[2]); return null;
}

// 测试
// http://localhost:3306/admin?id=111&name=xxx
// console.log(getQueryString(‘id‘)); // 111
// console.log(getQueryString(‘name‘)); // xxx
复制代码

018.对象处理为数组对象=============

/**

obj 需要处理的对象
*/
objToArrObj = obj => {
let arr = []
for(let i in obj){
arr.push({[i]:obj[i]})
}
return arr
}

// 测试数据
let obj = {20180410: 5, 20180411: 13, 20180412: 26, 20180413: 16}
console.log(objToArrObj(obj));
/*
[
{ 20180410: 5 },
{ 20180411: 13 },
{ 20180412: 26 },
{ 20180413: 16 }
]
*/

 ![手把手教你常用JS方法封装(一) [ 大杂烩 ]](http://p3.pstatp.com/large/dfic-imagehandler/a3548031-8354-4d74-a3c5-dd39f97e2390) 持续更新中...========常用JS方法封装方法预告：* 项目常用JS方法封装(二) [ 时间处理 ]* 项目常用JS方法封装(三) [ 字符串相关处理 ]* 项目常用JS方法封装(四) [ 数组相关处理 ]* * ***使用方法非常简单，只需放到你的 utils.js 工具文件中，直接 export const 加上我的封装方法，在别的文件中使用{方法1,方法2,方法3...}引用后就可以直接使用了!**001.输入一个值,返回其数据类型=================

type = para => {
return Object.prototype.toString.call(para).slice(8,-1)
}
复制代码

002.阶乘======

factorial = num => {
let count = 1;
for (let i = 1; i <= num; i++) {
count *= i;
}
return count;
}
复制代码

003.两个数之间累乘===========

004.累加======（）里面可以放N个实参

function cumsum() {
let sum = 0;
for (let i = 0; i < arguments.length; i++) {
sum += arguments[i];
}
return sum;
}
复制代码

005.计时器(计算代码块(函数)执行时间)======================**无参 computeTime(f)**

computeTime = code => {
let startTime = new Date().getTime();
code();
let endTime = new Date().getTime();
let time = endTime - startTime;
return time;
}
复制代码

**有参 computeTime(f)** 使用方法:computeTime(f,参数1,参数2......)

006.数字超过9显示省略号==============

num_filter = val =>{
val = val?val-0:0;
if (val > 9 ) {
return "…"
}else{
return val;
}
}
复制代码

007.数字超过99显示99+===============

ninenum_filter = val =>{
val = val?val-0:0;
if (val > 99 ) {
return "99+"
}else{
return val;
}
}
复制代码

008.银行卡号分割==========

bank_filter = val =>{
val += ‘‘;
val = val.replace(/(\s)/g,‘‘).replace(/(\d{4})/g,‘$1 ‘).replace(/\s*$/,‘‘);
return val;
}
复制代码

009.防抖与节流=========

/**

函数防抖 (只执行最后一次点击)
/
Debounce = (fn, t) => {
let delay = t || 500;
let timer;
return function () {
let args = arguments;
if(timer){
clearTimeout(timer);
}
timer = setTimeout(() => {
timer = null;
fn.apply(this, args);
}, delay);
}
};
/
函数节流
*/
Throttle = (fn, t) => {
let last;
let timer;
let interval = t || 500;
return function () {
let args = arguments;
let now = +new Date();
if (last && now - last < interval) {
clearTimeout(timer);
timer = setTimeout(() => {
last = now;
fn.apply(this, args);
}, interval);
} else {
last = now;
fn.apply(this, args);
}
}
};

复制代码

010.深拷贝=======

let str1 = {
arr: [1, 2, 3],
obj: {
key: ‘value‘
},
fn: function () {
return 1;
}
};
let str3 = deepClone(str1);

console.log(str3 === str1); // false
console.log(str3.obj === str1.obj); // false
console.log(str3.fn === str1.fn); // true
复制代码

011.获取视口尺寸==========**需要在HTML文件中运行**

012.数字前补零=========

/**

num为你想要进行填充的数字
length为你想要的数字长度
*/

//迭代方式实现
padding1=(num, length)=> {
for(let len = (num + "").length; len < length; len = num.length) {
num = "0" + num;
}
return num;
}

//递归方式实现
padding2=(num, length) =>{
if((num + "").length >= length) {
return num;
}
return padding2("0" + num, length)
}

//填充截取法
padding4=(num, length)=> {
//这里用slice和substr均可
return (Array(length).join("0") + num).slice(-length);
}

//填充截取法
padding5=(num, length)=> {
let len = (num + "").length;
let diff = length+1 - len;
if(diff > 0) {
return Array(diff).join("0") + num;
}
return num;
}
复制代码

013.格式转换：base64转file====================

/**

base64 base64
filename 转换后的文件名
/
base64ToFile = (base64, filename )=> {
let arr = base64.split(‘,‘)
let mime = arr[0].match(/难过.?);/)[1]
let suffix = mime.split(‘/‘)[1] // 图片后缀
let bstr = atob(arr[1])
let n = bstr.length
let u8arr = new Uint8Array(n)
while (n--) {
u8arr[n] = bstr.charCodeAt(n)
}
return new File([u8arr], ${filename}.${suffix}, { type: mime })
}
复制代码

014.格式转换：base64转blob====================

015.格式转换：blob转file==================

blobToFile = (blob, fileName) => {
blob.lastModifiedDate = new Date();
blob.name = fileName;
return blob;
};
复制代码

016.格式转换：file转base64====================

/**

file 图片文件
返回图片的Base64数据
*/
fileToBase64 = file => {
let reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (e) {
return e.target.result
};
}
复制代码

017.获取地址栏传递过来的参数================

/**

name为地址栏传递过来的字段名
/
getQueryString = name => {
let reg = new RegExp("(^|&)" + name + "=([^&])(&|$)");
let r = window.location.search.substr(1).match(reg);
if (r != null) return unescape(r[2]); return null;
}

// 测试
// http://localhost:3306/admin?id=111&name=xxx
// console.log(getQueryString(‘id‘)); // 111
// console.log(getQueryString(‘name‘)); // xxx
复制代码

018.对象处理为数组对象=============

/**

obj 需要处理的对象
*/
objToArrObj = obj => {
let arr = []
for(let i in obj){
arr.push({[i]:obj[i]})
}
return arr
}

// 测试数据
let obj = {20180410: 5, 20180411: 13, 20180412: 26, 20180413: 16}
console.log(objToArrObj(obj));
/*
[
{ 20180410: 5 },
{ 20180411: 13 },
{ 20180412: 26 },
{ 20180413: 16 }
]
*/

 ![手把手教你常用JS方法封装(一) [ 大杂烩 ]](http://p3.pstatp.com/large/dfic-imagehandler/a3548031-8354-4d74-a3c5-dd39f97e2390) 持续更新中...========常用JS方法封装方法预告：* 项目常用JS方法封装(二) [ 时间处理 ]* 项目常用JS方法封装(三) [ 字符串相关处理 ]* 项目常用JS方法封装(四) [ 数组相关处理 ]* * ***使用方法非常简单，只需放到你的 utils.js 工具文件中，直接 export const 加上我的封装方法，在别的文件中使用{方法1,方法2,方法3...}引用后就可以直接使用了!**001.输入一个值,返回其数据类型=================

type = para => {
return Object.prototype.toString.call(para).slice(8,-1)
}
复制代码

002.阶乘======

factorial = num => {
let count = 1;
for (let i = 1; i <= num; i++) {
count *= i;
}
return count;
}
复制代码

003.两个数之间累乘===========

004.累加======（）里面可以放N个实参

function cumsum() {
let sum = 0;
for (let i = 0; i < arguments.length; i++) {
sum += arguments[i];
}
return sum;
}
复制代码

005.计时器(计算代码块(函数)执行时间)======================**无参 computeTime(f)**

computeTime = code => {
let startTime = new Date().getTime();
code();
let endTime = new Date().getTime();
let time = endTime - startTime;
return time;
}
复制代码

**有参 computeTime(f)** 使用方法:computeTime(f,参数1,参数2......)

006.数字超过9显示省略号==============

num_filter = val =>{
val = val?val-0:0;
if (val > 9 ) {
return "…"
}else{
return val;
}
}
复制代码

007.数字超过99显示99+===============

ninenum_filter = val =>{
val = val?val-0:0;
if (val > 99 ) {
return "99+"
}else{
return val;
}
}
复制代码

008.银行卡号分割==========

bank_filter = val =>{
val += ‘‘;
val = val.replace(/(\s)/g,‘‘).replace(/(\d{4})/g,‘$1 ‘).replace(/\s*$/,‘‘);
return val;
}
复制代码

009.防抖与节流=========

/**

函数防抖 (只执行最后一次点击)
/
Debounce = (fn, t) => {
let delay = t || 500;
let timer;
return function () {
let args = arguments;
if(timer){
clearTimeout(timer);
}
timer = setTimeout(() => {
timer = null;
fn.apply(this, args);
}, delay);
}
};
/
函数节流
*/
Throttle = (fn, t) => {
let last;
let timer;
let interval = t || 500;
return function () {
let args = arguments;
let now = +new Date();
if (last && now - last < interval) {
clearTimeout(timer);
timer = setTimeout(() => {
last = now;
fn.apply(this, args);
}, interval);
} else {
last = now;
fn.apply(this, args);
}
}
};

复制代码

010.深拷贝=======

let str1 = {
arr: [1, 2, 3],
obj: {
key: ‘value‘
},
fn: function () {
return 1;
}
};
let str3 = deepClone(str1);

console.log(str3 === str1); // false
console.log(str3.obj === str1.obj); // false
console.log(str3.fn === str1.fn); // true
复制代码

011.获取视口尺寸==========**需要在HTML文件中运行**

012.数字前补零=========

/**

num为你想要进行填充的数字
length为你想要的数字长度
*/

//迭代方式实现
padding1=(num, length)=> {
for(let len = (num + "").length; len < length; len = num.length) {
num = "0" + num;
}
return num;
}

//递归方式实现
padding2=(num, length) =>{
if((num + "").length >= length) {
return num;
}
return padding2("0" + num, length)
}

//填充截取法
padding4=(num, length)=> {
//这里用slice和substr均可
return (Array(length).join("0") + num).slice(-length);
}

//填充截取法
padding5=(num, length)=> {
let len = (num + "").length;
let diff = length+1 - len;
if(diff > 0) {
return Array(diff).join("0") + num;
}
return num;
}
复制代码

013.格式转换：base64转file====================

/**

base64 base64
filename 转换后的文件名
/
base64ToFile = (base64, filename )=> {
let arr = base64.split(‘,‘)
let mime = arr[0].match(/难过.?);/)[1]
let suffix = mime.split(‘/‘)[1] // 图片后缀
let bstr = atob(arr[1])
let n = bstr.length
let u8arr = new Uint8Array(n)
while (n--) {
u8arr[n] = bstr.charCodeAt(n)
}
return new File([u8arr], ${filename}.${suffix}, { type: mime })
}
复制代码

014.格式转换：base64转blob====================

015.格式转换：blob转file==================

blobToFile = (blob, fileName) => {
blob.lastModifiedDate = new Date();
blob.name = fileName;
return blob;
};
复制代码

016.格式转换：file转base64====================

/**

file 图片文件
返回图片的Base64数据
*/
fileToBase64 = file => {
let reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (e) {
return e.target.result
};
}
复制代码

017.获取地址栏传递过来的参数================

/**

name为地址栏传递过来的字段名
/
getQueryString = name => {
let reg = new RegExp("(^|&)" + name + "=([^&])(&|$)");
let r = window.location.search.substr(1).match(reg);
if (r != null) return unescape(r[2]); return null;
}

// 测试
// http://localhost:3306/admin?id=111&name=xxx
// console.log(getQueryString(‘id‘)); // 111
// console.log(getQueryString(‘name‘)); // xxx
复制代码

018.对象处理为数组对象=============

/**

obj 需要处理的对象
*/
objToArrObj = obj => {
let arr = []
for(let i in obj){
arr.push({[i]:obj[i]})
}
return arr
}

// 测试数据
let obj = {20180410: 5, 20180411: 13, 20180412: 26, 20180413: 16}
console.log(objToArrObj(obj));
/*
[
{ 20180410: 5 },
{ 20180411: 13 },
{ 20180412: 26 },
{ 20180413: 16 }
]
*/

 ![手把手教你常用JS方法封装(一) [ 大杂烩 ]](http://p3.pstatp.com/large/dfic-imagehandler/a3548031-8354-4d74-a3c5-dd39f97e2390) 持续更新中...========常用JS方法封装方法预告：* 项目常用JS方法封装(二) [ 时间处理 ]* 项目常用JS方法封装(三) [ 字符串相关处理 ]* 项目常用JS方法封装(四) [ 数组相关处理 ]* * ***使用方法非常简单，只需放到你的 utils.js 工具文件中，直接 export const 加上我的封装方法，在别的文件中使用{方法1,方法2,方法3...}引用后就可以直接使用了!**001.输入一个值,返回其数据类型=================

type = para => {
return Object.prototype.toString.call(para).slice(8,-1)
}
复制代码

002.阶乘======

factorial = num => {
let count = 1;
for (let i = 1; i <= num; i++) {
count *= i;
}
return count;
}
复制代码

003.两个数之间累乘===========

004.累加======（）里面可以放N个实参

function cumsum() {
let sum = 0;
for (let i = 0; i < arguments.length; i++) {
sum += arguments[i];
}
return sum;
}
复制代码

005.计时器(计算代码块(函数)执行时间)======================**无参 computeTime(f)**

computeTime = code => {
let startTime = new Date().getTime();
code();
let endTime = new Date().getTime();
let time = endTime - startTime;
return time;
}
复制代码

**有参 computeTime(f)** 使用方法:computeTime(f,参数1,参数2......)

006.数字超过9显示省略号==============

num_filter = val =>{
val = val?val-0:0;
if (val > 9 ) {
return "…"
}else{
return val;
}
}
复制代码

007.数字超过99显示99+===============

ninenum_filter = val =>{
val = val?val-0:0;
if (val > 99 ) {
return "99+"
}else{
return val;
}
}
复制代码

008.银行卡号分割==========

bank_filter = val =>{
val += ‘‘;
val = val.replace(/(\s)/g,‘‘).replace(/(\d{4})/g,‘$1 ‘).replace(/\s*$/,‘‘);
return val;
}
复制代码

009.防抖与节流=========

/**

函数防抖 (只执行最后一次点击)
/
Debounce = (fn, t) => {
let delay = t || 500;
let timer;
return function () {
let args = arguments;
if(timer){
clearTimeout(timer);
}
timer = setTimeout(() => {
timer = null;
fn.apply(this, args);
}, delay);
}
};
/
函数节流
*/
Throttle = (fn, t) => {
let last;
let timer;
let interval = t || 500;
return function () {
let args = arguments;
let now = +new Date();
if (last && now - last < interval) {
clearTimeout(timer);
timer = setTimeout(() => {
last = now;
fn.apply(this, args);
}, interval);
} else {
last = now;
fn.apply(this, args);
}
}
};

复制代码

010.深拷贝=======

let str1 = {
arr: [1, 2, 3],
obj: {
key: ‘value‘
},
fn: function () {
return 1;
}
};
let str3 = deepClone(str1);

console.log(str3 === str1); // false
console.log(str3.obj === str1.obj); // false
console.log(str3.fn === str1.fn); // true
复制代码

011.获取视口尺寸==========**需要在HTML文件中运行**

012.数字前补零=========

/**

num为你想要进行填充的数字
length为你想要的数字长度
*/

//迭代方式实现
padding1=(num, length)=> {
for(let len = (num + "").length; len < length; len = num.length) {
num = "0" + num;
}
return num;
}

//递归方式实现
padding2=(num, length) =>{
if((num + "").length >= length) {
return num;
}
return padding2("0" + num, length)
}

//填充截取法
padding4=(num, length)=> {
//这里用slice和substr均可
return (Array(length).join("0") + num).slice(-length);
}

//填充截取法
padding5=(num, length)=> {
let len = (num + "").length;
let diff = length+1 - len;
if(diff > 0) {
return Array(diff).join("0") + num;
}
return num;
}
复制代码

013.格式转换：base64转file====================

/**

base64 base64
filename 转换后的文件名
/
base64ToFile = (base64, filename )=> {
let arr = base64.split(‘,‘)
let mime = arr[0].match(/难过.?);/)[1]
let suffix = mime.split(‘/‘)[1] // 图片后缀
let bstr = atob(arr[1])
let n = bstr.length
let u8arr = new Uint8Array(n)
while (n--) {
u8arr[n] = bstr.charCodeAt(n)
}
return new File([u8arr], ${filename}.${suffix}, { type: mime })
}
复制代码

014.格式转换：base64转blob====================

015.格式转换：blob转file==================

blobToFile = (blob, fileName) => {
blob.lastModifiedDate = new Date();
blob.name = fileName;
return blob;
};
复制代码

016.格式转换：file转base64====================

/**

file 图片文件
返回图片的Base64数据
*/
fileToBase64 = file => {
let reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (e) {
return e.target.result
};
}
复制代码

017.获取地址栏传递过来的参数================

/**

name为地址栏传递过来的字段名
/
getQueryString = name => {
let reg = new RegExp("(^|&)" + name + "=([^&])(&|$)");
let r = window.location.search.substr(1).match(reg);
if (r != null) return unescape(r[2]); return null;
}

// 测试
// http://localhost:3306/admin?id=111&name=xxx
// console.log(getQueryString(‘id‘)); // 111
// console.log(getQueryString(‘name‘)); // xxx
复制代码

018.对象处理为数组对象=============

/**

obj 需要处理的对象
*/
objToArrObj = obj => {
let arr = []
for(let i in obj){
arr.push({[i]:obj[i]})
}
return arr
}

// 测试数据
let obj = {20180410: 5, 20180411: 13, 20180412: 26, 20180413: 16}
console.log(objToArrObj(obj));
/*
[
{ 20180410: 5 },
{ 20180411: 13 },
{ 20180412: 26 },
{ 20180413: 16 }
]
*/

 ![手把手教你常用JS方法封装(一) [ 大杂烩 ]](http://p3.pstatp.com/large/dfic-imagehandler/a3548031-8354-4d74-a3c5-dd39f97e2390) 持续更新中...========常用JS方法封装方法预告：* 项目常用JS方法封装(二) [ 时间处理 ]* 项目常用JS方法封装(三) [ 字符串相关处理 ]* 项目常用JS方法封装(四) [ 数组相关处理 ]* * ***使用方法非常简单，只需放到你的 utils.js 工具文件中，直接 export const 加上我的封装方法，在别的文件中使用{方法1,方法2,方法3...}引用后就可以直接使用了!**001.输入一个值,返回其数据类型=================

type = para => {
return Object.prototype.toString.call(para).slice(8,-1)
}
复制代码

002.阶乘======

factorial = num => {
let count = 1;
for (let i = 1; i <= num; i++) {
count *= i;
}
return count;
}
复制代码

003.两个数之间累乘===========

004.累加======（）里面可以放N个实参

function cumsum() {
let sum = 0;
for (let i = 0; i < arguments.length; i++) {
sum += arguments[i];
}
return sum;
}
复制代码

005.计时器(计算代码块(函数)执行时间)======================**无参 computeTime(f)**

computeTime = code => {
let startTime = new Date().getTime();
code();
let endTime = new Date().getTime();
let time = endTime - startTime;
return time;
}
复制代码

**有参 computeTime(f)** 使用方法:computeTime(f,参数1,参数2......)

006.数字超过9显示省略号==============

num_filter = val =>{
val = val?val-0:0;
if (val > 9 ) {
return "…"
}else{
return val;
}
}
复制代码

007.数字超过99显示99+===============

ninenum_filter = val =>{
val = val?val-0:0;
if (val > 99 ) {
return "99+"
}else{
return val;
}
}
复制代码

008.银行卡号分割==========

bank_filter = val =>{
val += ‘‘;
val = val.replace(/(\s)/g,‘‘).replace(/(\d{4})/g,‘$1 ‘).replace(/\s*$/,‘‘);
return val;
}
复制代码

009.防抖与节流=========

/**

函数防抖 (只执行最后一次点击)
/
Debounce = (fn, t) => {
let delay = t || 500;
let timer;
return function () {
let args = arguments;
if(timer){
clearTimeout(timer);
}
timer = setTimeout(() => {
timer = null;
fn.apply(this, args);
}, delay);
}
};
/
函数节流
*/
Throttle = (fn, t) => {
let last;
let timer;
let interval = t || 500;
return function () {
let args = arguments;
let now = +new Date();
if (last && now - last < interval) {
clearTimeout(timer);
timer = setTimeout(() => {
last = now;
fn.apply(this, args);
}, interval);
} else {
last = now;
fn.apply(this, args);
}
}
};

复制代码

010.深拷贝=======

let str1 = {
arr: [1, 2, 3],
obj: {
key: ‘value‘
},
fn: function () {
return 1;
}
};
let str3 = deepClone(str1);

console.log(str3 === str1); // false
console.log(str3.obj === str1.obj); // false
console.log(str3.fn === str1.fn); // true
复制代码

011.获取视口尺寸==========**需要在HTML文件中运行**

012.数字前补零=========

/**

num为你想要进行填充的数字
length为你想要的数字长度
*/

//迭代方式实现
padding1=(num, length)=> {
for(let len = (num + "").length; len < length; len = num.length) {
num = "0" + num;
}
return num;
}

//递归方式实现
padding2=(num, length) =>{
if((num + "").length >= length) {
return num;
}
return padding2("0" + num, length)
}

//填充截取法
padding4=(num, length)=> {
//这里用slice和substr均可
return (Array(length).join("0") + num).slice(-length);
}

//填充截取法
padding5=(num, length)=> {
let len = (num + "").length;
let diff = length+1 - len;
if(diff > 0) {
return Array(diff).join("0") + num;
}
return num;
}
复制代码

013.格式转换：base64转file====================

/**

base64 base64
filename 转换后的文件名
/
base64ToFile = (base64, filename )=> {
let arr = base64.split(‘,‘)
let mime = arr[0].match(/难过.?);/)[1]
let suffix = mime.split(‘/‘)[1] // 图片后缀
let bstr = atob(arr[1])
let n = bstr.length
let u8arr = new Uint8Array(n)
while (n--) {
u8arr[n] = bstr.charCodeAt(n)
}
return new File([u8arr], ${filename}.${suffix}, { type: mime })
}
复制代码

014.格式转换：base64转blob====================

015.格式转换：blob转file==================

blobToFile = (blob, fileName) => {
blob.lastModifiedDate = new Date();
blob.name = fileName;
return blob;
};
复制代码

016.格式转换：file转base64====================

/**

file 图片文件
返回图片的Base64数据
*/
fileToBase64 = file => {
let reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (e) {
return e.target.result
};
}
复制代码

017.获取地址栏传递过来的参数================

/**

name为地址栏传递过来的字段名
/
getQueryString = name => {
let reg = new RegExp("(^|&)" + name + "=([^&])(&|$)");
let r = window.location.search.substr(1).match(reg);
if (r != null) return unescape(r[2]); return null;
}

// 测试
// http://localhost:3306/admin?id=111&name=xxx
// console.log(getQueryString(‘id‘)); // 111
// console.log(getQueryString(‘name‘)); // xxx
复制代码

018.对象处理为数组对象=============

/**

obj 需要处理的对象
*/
objToArrObj = obj => {
let arr = []
for(let i in obj){
arr.push({[i]:obj[i]})
}
return arr
}

// 测试数据
let obj = {20180410: 5, 20180411: 13, 20180412: 26, 20180413: 16}
console.log(objToArrObj(obj));
/*
[
{ 20180410: 5 },
{ 20180411: 13 },
{ 20180412: 26 },
{ 20180413: 16 }
]
*/

 ![手把手教你常用JS方法封装(一) [ 大杂烩 ]](http://p3.pstatp.com/large/dfic-imagehandler/a3548031-8354-4d74-a3c5-dd39f97e2390) 持续更新中...========常用JS方法封装方法预告：* 项目常用JS方法封装(二) [ 时间处理 ]* 项目常用JS方法封装(三) [ 字符串相关处理 ]* 项目常用JS方法封装(四) [ 数组相关处理 ]* * ***使用方法非常简单，只需放到你的 utils.js 工具文件中，直接 export const 加上我的封装方法，在别的文件中使用{方法1,方法2,方法3...}引用后就可以直接使用了!**001.输入一个值,返回其数据类型=================

type = para => {
return Object.prototype.toString.call(para).slice(8,-1)
}
复制代码

002.阶乘======

factorial = num => {
let count = 1;
for (let i = 1; i <= num; i++) {
count *= i;
}
return count;
}
复制代码

003.两个数之间累乘===========

004.累加======（）里面可以放N个实参

function cumsum() {
let sum = 0;
for (let i = 0; i < arguments.length; i++) {
sum += arguments[i];
}
return sum;
}
复制代码

005.计时器(计算代码块(函数)执行时间)======================**无参 computeTime(f)**

computeTime = code => {
let startTime = new Date().getTime();
code();
let endTime = new Date().getTime();
let time = endTime - startTime;
return time;
}
复制代码

**有参 computeTime(f)** 使用方法:computeTime(f,参数1,参数2......)

006.数字超过9显示省略号==============

num_filter = val =>{
val = val?val-0:0;
if (val > 9 ) {
return "…"
}else{
return val;
}
}
复制代码

007.数字超过99显示99+===============

ninenum_filter = val =>{
val = val?val-0:0;
if (val > 99 ) {
return "99+"
}else{
return val;
}
}
复制代码

008.银行卡号分割==========

bank_filter = val =>{
val += ‘‘;
val = val.replace(/(\s)/g,‘‘).replace(/(\d{4})/g,‘$1 ‘).replace(/\s*$/,‘‘);
return val;
}
复制代码

009.防抖与节流=========

/**

函数防抖 (只执行最后一次点击)
/
Debounce = (fn, t) => {
let delay = t || 500;
let timer;
return function () {
let args = arguments;
if(timer){
clearTimeout(timer);
}
timer = setTimeout(() => {
timer = null;
fn.apply(this, args);
}, delay);
}
};
/
函数节流
*/
Throttle = (fn, t) => {
let last;
let timer;
let interval = t || 500;
return function () {
let args = arguments;
let now = +new Date();
if (last && now - last < interval) {
clearTimeout(timer);
timer = setTimeout(() => {
last = now;
fn.apply(this, args);
}, interval);
} else {
last = now;
fn.apply(this, args);
}
}
};

复制代码

010.深拷贝=======

let str1 = {
arr: [1, 2, 3],
obj: {
key: ‘value‘
},
fn: function () {
return 1;
}
};
let str3 = deepClone(str1);

console.log(str3 === str1); // false
console.log(str3.obj === str1.obj); // false
console.log(str3.fn === str1.fn); // true
复制代码

011.获取视口尺寸==========**需要在HTML文件中运行**

012.数字前补零=========

/**

num为你想要进行填充的数字
length为你想要的数字长度
*/

//迭代方式实现
padding1=(num, length)=> {
for(let len = (num + "").length; len < length; len = num.length) {
num = "0" + num;
}
return num;
}

//递归方式实现
padding2=(num, length) =>{
if((num + "").length >= length) {
return num;
}
return padding2("0" + num, length)
}

//填充截取法
padding4=(num, length)=> {
//这里用slice和substr均可
return (Array(length).join("0") + num).slice(-length);
}

//填充截取法
padding5=(num, length)=> {
let len = (num + "").length;
let diff = length+1 - len;
if(diff > 0) {
return Array(diff).join("0") + num;
}
return num;
}
复制代码

013.格式转换：base64转file====================

/**

base64 base64
filename 转换后的文件名
/
base64ToFile = (base64, filename )=> {
let arr = base64.split(‘,‘)
let mime = arr[0].match(/难过.?);/)[1]
let suffix = mime.split(‘/‘)[1] // 图片后缀
let bstr = atob(arr[1])
let n = bstr.length
let u8arr = new Uint8Array(n)
while (n--) {
u8arr[n] = bstr.charCodeAt(n)
}
return new File([u8arr], ${filename}.${suffix}, { type: mime })
}
复制代码

014.格式转换：base64转blob====================

015.格式转换：blob转file==================

blobToFile = (blob, fileName) => {
blob.lastModifiedDate = new Date();
blob.name = fileName;
return blob;
};
复制代码

016.格式转换：file转base64====================

/**

file 图片文件
返回图片的Base64数据
*/
fileToBase64 = file => {
let reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (e) {
return e.target.result
};
}
复制代码

017.获取地址栏传递过来的参数================

/**

name为地址栏传递过来的字段名
/
getQueryString = name => {
let reg = new RegExp("(^|&)" + name + "=([^&])(&|$)");
let r = window.location.search.substr(1).match(reg);
if (r != null) return unescape(r[2]); return null;
}

// 测试
// http://localhost:3306/admin?id=111&name=xxx
// console.log(getQueryString(‘id‘)); // 111
// console.log(getQueryString(‘name‘)); // xxx
复制代码

018.对象处理为数组对象=============

/**

obj 需要处理的对象
*/
objToArrObj = obj => {
let arr = []
for(let i in obj){
arr.push({[i]:obj[i]})
}
return arr
}

// 测试数据
let obj = {20180410: 5, 20180411: 13, 20180412: 26, 20180413: 16}
console.log(objToArrObj(obj));
/*
[
{ 20180410: 5 },
{ 20180411: 13 },
{ 20180412: 26 },
{ 20180413: 16 }
]
*/

 ![手把手教你常用JS方法封装(一) [ 大杂烩 ]](http://p3.pstatp.com/large/dfic-imagehandler/a3548031-8354-4d74-a3c5-dd39f97e2390) 持续更新中...========常用JS方法封装方法预告：* 项目常用JS方法封装(二) [ 时间处理 ]* 项目常用JS方法封装(三) [ 字符串相关处理 ]* 项目常用JS方法封装(四) [ 数组相关处理 ]* * ***使用方法非常简单，只需放到你的 utils.js 工具文件中，直接 export const 加上我的封装方法，在别的文件中使用{方法1,方法2,方法3...}引用后就可以直接使用了!**001.输入一个值,返回其数据类型=================

type = para => {
return Object.prototype.toString.call(para).slice(8,-1)
}
复制代码

002.阶乘======

factorial = num => {
let count = 1;
for (let i = 1; i <= num; i++) {
count *= i;
}
return count;
}
复制代码

003.两个数之间累乘===========

004.累加======（）里面可以放N个实参

function cumsum() {
let sum = 0;
for (let i = 0; i < arguments.length; i++) {
sum += arguments[i];
}
return sum;
}
复制代码

005.计时器(计算代码块(函数)执行时间)======================**无参 computeTime(f)**

computeTime = code => {
let startTime = new Date().getTime();
code();
let endTime = new Date().getTime();
let time = endTime - startTime;
return time;
}
复制代码

**有参 computeTime(f)** 使用方法:computeTime(f,参数1,参数2......)

006.数字超过9显示省略号==============

num_filter = val =>{
val = val?val-0:0;
if (val > 9 ) {
return "…"
}else{
return val;
}
}
复制代码

007.数字超过99显示99+===============

ninenum_filter = val =>{
val = val?val-0:0;
if (val > 99 ) {
return "99+"
}else{
return val;
}
}
复制代码

008.银行卡号分割==========

bank_filter = val =>{
val += ‘‘;
val = val.replace(/(\s)/g,‘‘).replace(/(\d{4})/g,‘$1 ‘).replace(/\s*$/,‘‘);
return val;
}
复制代码

009.防抖与节流=========

/**

函数防抖 (只执行最后一次点击)
/
Debounce = (fn, t) => {
let delay = t || 500;
let timer;
return function () {
let args = arguments;
if(timer){
clearTimeout(timer);
}
timer = setTimeout(() => {
timer = null;
fn.apply(this, args);
}, delay);
}
};
/
函数节流
*/
Throttle = (fn, t) => {
let last;
let timer;
let interval = t || 500;
return function () {
let args = arguments;
let now = +new Date();
if (last && now - last < interval) {
clearTimeout(timer);
timer = setTimeout(() => {
last = now;
fn.apply(this, args);
}, interval);
} else {
last = now;
fn.apply(this, args);
}
}
};

复制代码

010.深拷贝=======

let str1 = {
arr: [1, 2, 3],
obj: {
key: ‘value‘
},
fn: function () {
return 1;
}
};
let str3 = deepClone(str1);

console.log(str3 === str1); // false
console.log(str3.obj === str1.obj); // false
console.log(str3.fn === str1.fn); // true
复制代码

011.获取视口尺寸==========**需要在HTML文件中运行**

012.数字前补零=========

/**

num为你想要进行填充的数字
length为你想要的数字长度
*/

//迭代方式实现
padding1=(num, length)=> {
for(let len = (num + "").length; len < length; len = num.length) {
num = "0" + num;
}
return num;
}

//递归方式实现
padding2=(num, length) =>{
if((num + "").length >= length) {
return num;
}
return padding2("0" + num, length)
}

//填充截取法
padding4=(num, length)=> {
//这里用slice和substr均可
return (Array(length).join("0") + num).slice(-length);
}

//填充截取法
padding5=(num, length)=> {
let len = (num + "").length;
let diff = length+1 - len;
if(diff > 0) {
return Array(diff).join("0") + num;
}
return num;
}
复制代码

013.格式转换：base64转file====================

/**

base64 base64
filename 转换后的文件名
/
base64ToFile = (base64, filename )=> {
let arr = base64.split(‘,‘)
let mime = arr[0].match(/难过.?);/)[1]
let suffix = mime.split(‘/‘)[1] // 图片后缀
let bstr = atob(arr[1])
let n = bstr.length
let u8arr = new Uint8Array(n)
while (n--) {
u8arr[n] = bstr.charCodeAt(n)
}
return new File([u8arr], ${filename}.${suffix}, { type: mime })
}
复制代码

014.格式转换：base64转blob====================

015.格式转换：blob转file==================

blobToFile = (blob, fileName) => {
blob.lastModifiedDate = new Date();
blob.name = fileName;
return blob;
};
复制代码

016.格式转换：file转base64====================

/**

file 图片文件
返回图片的Base64数据
*/
fileToBase64 = file => {
let reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (e) {
return e.target.result
};
}
复制代码

017.获取地址栏传递过来的参数================

/**

name为地址栏传递过来的字段名
/
getQueryString = name => {
let reg = new RegExp("(^|&)" + name + "=([^&])(&|$)");
let r = window.location.search.substr(1).match(reg);
if (r != null) return unescape(r[2]); return null;
}

// 测试
// http://localhost:3306/admin?id=111&name=xxx
// console.log(getQueryString(‘id‘)); // 111
// console.log(getQueryString(‘name‘)); // xxx
复制代码

018.对象处理为数组对象=============

/**

obj 需要处理的对象
*/
objToArrObj = obj => {
let arr = []
for(let i in obj){
arr.push({[i]:obj[i]})
}
return arr
}

// 测试数据
let obj = {20180410: 5, 20180411: 13, 20180412: 26, 20180413: 16}
console.log(objToArrObj(obj));
/*
[
{ 20180410: 5 },
{ 20180411: 13 },
{ 20180412: 26 },
{ 20180413: 16 }
]
*/

 ![手把手教你常用JS方法封装(一) [ 大杂烩 ]](http://p3.pstatp.com/large/dfic-imagehandler/a3548031-8354-4d74-a3c5-dd39f97e2390) 持续更新中...========常用JS方法封装方法预告：* 项目常用JS方法封装(二) [ 时间处理 ]* 项目常用JS方法封装(三) [ 字符串相关处理 ]* 项目常用JS方法封装(四) [ 数组相关处理 ]* * ***使用方法非常简单，只需放到你的 utils.js 工具文件中，直接 export const 加上我的封装方法，在别的文件中使用{方法1,方法2,方法3...}引用后就可以直接使用了!**001.输入一个值,返回其数据类型=================

type = para => {
return Object.prototype.toString.call(para).slice(8,-1)
}
复制代码

002.阶乘======

factorial = num => {
let count = 1;
for (let i = 1; i <= num; i++) {
count *= i;
}
return count;
}
复制代码

003.两个数之间累乘===========

004.累加======（）里面可以放N个实参

function cumsum() {
let sum = 0;
for (let i = 0; i < arguments.length; i++) {
sum += arguments[i];
}
return sum;
}
复制代码

005.计时器(计算代码块(函数)执行时间)======================**无参 computeTime(f)**

computeTime = code => {
let startTime = new Date().getTime();
code();
let endTime = new Date().getTime();
let time = endTime - startTime;
return time;
}
复制代码

**有参 computeTime(f)** 使用方法:computeTime(f,参数1,参数2......)

006.数字超过9显示省略号==============

num_filter = val =>{
val = val?val-0:0;
if (val > 9 ) {
return "…"
}else{
return val;
}
}
复制代码

007.数字超过99显示99+===============

ninenum_filter = val =>{
val = val?val-0:0;
if (val > 99 ) {
return "99+"
}else{
return val;
}
}
复制代码

008.银行卡号分割==========

bank_filter = val =>{
val += ‘‘;
val = val.replace(/(\s)/g,‘‘).replace(/(\d{4})/g,‘$1 ‘).replace(/\s*$/,‘‘);
return val;
}
复制代码

009.防抖与节流=========

/**

函数防抖 (只执行最后一次点击)
/
Debounce = (fn, t) => {
let delay = t || 500;
let timer;
return function () {
let args = arguments;
if(timer){
clearTimeout(timer);
}
timer = setTimeout(() => {
timer = null;
fn.apply(this, args);
}, delay);
}
};
/
函数节流
*/
Throttle = (fn, t) => {
let last;
let timer;
let interval = t || 500;
return function () {
let args = arguments;
let now = +new Date();
if (last && now - last < interval) {
clearTimeout(timer);
timer = setTimeout(() => {
last = now;
fn.apply(this, args);
}, interval);
} else {
last = now;
fn.apply(this, args);
}
}
};

复制代码

010.深拷贝=======

let str1 = {
arr: [1, 2, 3],
obj: {
key: ‘value‘
},
fn: function () {
return 1;
}
};
let str3 = deepClone(str1);

console.log(str3 === str1); // false
console.log(str3.obj === str1.obj); // false
console.log(str3.fn === str1.fn); // true
复制代码

011.获取视口尺寸==========**需要在HTML文件中运行**

012.数字前补零=========

/**

num为你想要进行填充的数字
length为你想要的数字长度
*/

//迭代方式实现
padding1=(num, length)=> {
for(let len = (num + "").length; len < length; len = num.length) {
num = "0" + num;
}
return num;
}

//递归方式实现
padding2=(num, length) =>{
if((num + "").length >= length) {
return num;
}
return padding2("0" + num, length)
}

//填充截取法
padding4=(num, length)=> {
//这里用slice和substr均可
return (Array(length).join("0") + num).slice(-length);
}

//填充截取法
padding5=(num, length)=> {
let len = (num + "").length;
let diff = length+1 - len;
if(diff > 0) {
return Array(diff).join("0") + num;
}
return num;
}
复制代码

013.格式转换：base64转file====================

/**

base64 base64
filename 转换后的文件名
/
base64ToFile = (base64, filename )=> {
let arr = base64.split(‘,‘)
let mime = arr[0].match(/难过.?);/)[1]
let suffix = mime.split(‘/‘)[1] // 图片后缀
let bstr = atob(arr[1])
let n = bstr.length
let u8arr = new Uint8Array(n)
while (n--) {
u8arr[n] = bstr.charCodeAt(n)
}
return new File([u8arr], ${filename}.${suffix}, { type: mime })
}
复制代码

014.格式转换：base64转blob====================

015.格式转换：blob转file==================

blobToFile = (blob, fileName) => {
blob.lastModifiedDate = new Date();
blob.name = fileName;
return blob;
};
复制代码

016.格式转换：file转base64====================

/**

file 图片文件
返回图片的Base64数据
*/
fileToBase64 = file => {
let reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (e) {
return e.target.result
};
}
复制代码

017.获取地址栏传递过来的参数================

/**

name为地址栏传递过来的字段名
/
getQueryString = name => {
let reg = new RegExp("(^|&)" + name + "=([^&])(&|$)");
let r = window.location.search.substr(1).match(reg);
if (r != null) return unescape(r[2]); return null;
}

// 测试
// http://localhost:3306/admin?id=111&name=xxx
// console.log(getQueryString(‘id‘)); // 111
// console.log(getQueryString(‘name‘)); // xxx
复制代码

018.对象处理为数组对象=============

/**

obj 需要处理的对象
*/
objToArrObj = obj => {
let arr = []
for(let i in obj){
arr.push({[i]:obj[i]})
}
return arr
}

// 测试数据
let obj = {20180410: 5, 20180411: 13, 20180412: 26, 20180413: 16}
console.log(objToArrObj(obj));
/*
[
{ 20180410: 5 },
{ 20180411: 13 },
{ 20180412: 26 },
{ 20180413: 16 }
]
*/

 ![手把手教你常用JS方法封装(一) [ 大杂烩 ]](http://p3.pstatp.com/large/dfic-imagehandler/a3548031-8354-4d74-a3c5-dd39f97e2390) 持续更新中...========常用JS方法封装方法预告：* 项目常用JS方法封装(二) [ 时间处理 ]* 项目常用JS方法封装(三) [ 字符串相关处理 ]* 项目常用JS方法封装(四) [ 数组相关处理 ]* * ***使用方法非常简单，只需放到你的 utils.js 工具文件中，直接 export const 加上我的封装方法，在别的文件中使用{方法1,方法2,方法3...}引用后就可以直接使用了!**001.输入一个值,返回其数据类型=================

type = para => {
return Object.prototype.toString.call(para).slice(8,-1)
}
复制代码

002.阶乘======

factorial = num => {
let count = 1;
for (let i = 1; i <= num; i++) {
count *= i;
}
return count;
}
复制代码

003.两个数之间累乘===========

004.累加======（）里面可以放N个实参

function cumsum() {
let sum = 0;
for (let i = 0; i < arguments.length; i++) {
sum += arguments[i];
}
return sum;
}
复制代码

005.计时器(计算代码块(函数)执行时间)======================**无参 computeTime(f)**

computeTime = code => {
let startTime = new Date().getTime();
code();
let endTime = new Date().getTime();
let time = endTime - startTime;
return time;
}
复制代码

**有参 computeTime(f)** 使用方法:computeTime(f,参数1,参数2......)

006.数字超过9显示省略号==============

num_filter = val =>{
val = val?val-0:0;
if (val > 9 ) {
return "…"
}else{
return val;
}
}
复制代码

007.数字超过99显示99+===============

ninenum_filter = val =>{
val = val?val-0:0;
if (val > 99 ) {
return "99+"
}else{
return val;
}
}
复制代码

008.银行卡号分割==========

bank_filter = val =>{
val += ‘‘;
val = val.replace(/(\s)/g,‘‘).replace(/(\d{4})/g,‘$1 ‘).replace(/\s*$/,‘‘);
return val;
}
复制代码

009.防抖与节流=========

/**

函数防抖 (只执行最后一次点击)
/
Debounce = (fn, t) => {
let delay = t || 500;
let timer;
return function () {
let args = arguments;
if(timer){
clearTimeout(timer);
}
timer = setTimeout(() => {
timer = null;
fn.apply(this, args);
}, delay);
}
};
/
函数节流
*/
Throttle = (fn, t) => {
let last;
let timer;
let interval = t || 500;
return function () {
let args = arguments;
let now = +new Date();
if (last && now - last < interval) {
clearTimeout(timer);
timer = setTimeout(() => {
last = now;
fn.apply(this, args);
}, interval);
} else {
last = now;
fn.apply(this, args);
}
}
};

复制代码

010.深拷贝=======

let str1 = {
arr: [1, 2, 3],
obj: {
key: ‘value‘
},
fn: function () {
return 1;
}
};
let str3 = deepClone(str1);

console.log(str3 === str1); // false
console.log(str3.obj === str1.obj); // false
console.log(str3.fn === str1.fn); // true
复制代码

011.获取视口尺寸==========**需要在HTML文件中运行**

012.数字前补零=========

/**

num为你想要进行填充的数字
length为你想要的数字长度
*/

//迭代方式实现
padding1=(num, length)=> {
for(let len = (num + "").length; len < length; len = num.length) {
num = "0" + num;
}
return num;
}

//递归方式实现
padding2=(num, length) =>{
if((num + "").length >= length) {
return num;
}
return padding2("0" + num, length)
}

//填充截取法
padding4=(num, length)=> {
//这里用slice和substr均可
return (Array(length).join("0") + num).slice(-length);
}

//填充截取法
padding5=(num, length)=> {
let len = (num + "").length;
let diff = length+1 - len;
if(diff > 0) {
return Array(diff).join("0") + num;
}
return num;
}
复制代码

013.格式转换：base64转file====================

/**

base64 base64
filename 转换后的文件名
/
base64ToFile = (base64, filename )=> {
let arr = base64.split(‘,‘)
let mime = arr[0].match(/难过.?);/)[1]
let suffix = mime.split(‘/‘)[1] // 图片后缀
let bstr = atob(arr[1])
let n = bstr.length
let u8arr = new Uint8Array(n)
while (n--) {
u8arr[n] = bstr.charCodeAt(n)
}
return new File([u8arr], ${filename}.${suffix}, { type: mime })
}
复制代码

014.格式转换：base64转blob====================

015.格式转换：blob转file==================

blobToFile = (blob, fileName) => {
blob.lastModifiedDate = new Date();
blob.name = fileName;
return blob;
};
复制代码

016.格式转换：file转base64====================

/**

file 图片文件
返回图片的Base64数据
*/
fileToBase64 = file => {
let reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (e) {
return e.target.result
};
}
复制代码

017.获取地址栏传递过来的参数================

/**

name为地址栏传递过来的字段名
/
getQueryString = name => {
let reg = new RegExp("(^|&)" + name + "=([^&])(&|$)");
let r = window.location.search.substr(1).match(reg);
if (r != null) return unescape(r[2]); return null;
}

// 测试
// http://localhost:3306/admin?id=111&name=xxx
// console.log(getQueryString(‘id‘)); // 111
// console.log(getQueryString(‘name‘)); // xxx
复制代码

018.对象处理为数组对象=============

/**

obj 需要处理的对象
*/
objToArrObj = obj => {
let arr = []
for(let i in obj){
arr.push({[i]:obj[i]})
}
return arr
}

// 测试数据
let obj = {20180410: 5, 20180411: 13, 20180412: 26, 20180413: 16}
console.log(objToArrObj(obj));
/*
[
{ 20180410: 5 },
{ 20180411: 13 },
{ 20180412: 26 },
{ 20180413: 16 }
]
*/

 ![手把手教你常用JS方法封装(一) [ 大杂烩 ]](http://p3.pstatp.com/large/dfic-imagehandler/a3548031-8354-4d74-a3c5-dd39f97e2390) 持续更新中...========常用JS方法封装方法预告：* 项目常用JS方法封装(二) [ 时间处理 ]* 项目常用JS方法封装(三) [ 字符串相关处理 ]* 项目常用JS方法封装(四) [ 数组相关处理 ]* * ***使用方法非常简单，只需放到你的 utils.js 工具文件中，直接 export const 加上我的封装方法，在别的文件中使用{方法1,方法2,方法3...}引用后就可以直接使用了!**001.输入一个值,返回其数据类型=================

type = para => {
return Object.prototype.toString.call(para).slice(8,-1)
}
复制代码

002.阶乘======

factorial = num => {
let count = 1;
for (let i = 1; i <= num; i++) {
count *= i;
}
return count;
}
复制代码

003.两个数之间累乘===========

004.累加======（）里面可以放N个实参

function cumsum() {
let sum = 0;
for (let i = 0; i < arguments.length; i++) {
sum += arguments[i];
}
return sum;
}
复制代码

005.计时器(计算代码块(函数)执行时间)======================**无参 computeTime(f)**

computeTime = code => {
let startTime = new Date().getTime();
code();
let endTime = new Date().getTime();
let time = endTime - startTime;
return time;
}
复制代码

**有参 computeTime(f)** 使用方法:computeTime(f,参数1,参数2......)

006.数字超过9显示省略号==============

num_filter = val =>{
val = val?val-0:0;
if (val > 9 ) {
return "…"
}else{
return val;
}
}
复制代码

007.数字超过99显示99+===============

ninenum_filter = val =>{
val = val?val-0:0;
if (val > 99 ) {
return "99+"
}else{
return val;
}
}
复制代码

008.银行卡号分割==========

bank_filter = val =>{
val += ‘‘;
val = val.replace(/(\s)/g,‘‘).replace(/(\d{4})/g,‘$1 ‘).replace(/\s*$/,‘‘);
return val;
}
复制代码

009.防抖与节流=========

/**

函数防抖 (只执行最后一次点击)
/
Debounce = (fn, t) => {
let delay = t || 500;
let timer;
return function () {
let args = arguments;
if(timer){
clearTimeout(timer);
}
timer = setTimeout(() => {
timer = null;
fn.apply(this, args);
}, delay);
}
};
/
函数节流
*/
Throttle = (fn, t) => {
let last;
let timer;
let interval = t || 500;
return function () {
let args = arguments;
let now = +new Date();
if (last && now - last < interval) {
clearTimeout(timer);
timer = setTimeout(() => {
last = now;
fn.apply(this, args);
}, interval);
} else {
last = now;
fn.apply(this, args);
}
}
};

复制代码

010.深拷贝=======

let str1 = {
arr: [1, 2, 3],
obj: {
key: ‘value‘
},
fn: function () {
return 1;
}
};
let str3 = deepClone(str1);

console.log(str3 === str1); // false
console.log(str3.obj === str1.obj); // false
console.log(str3.fn === str1.fn); // true
复制代码

011.获取视口尺寸==========**需要在HTML文件中运行**

012.数字前补零=========

/**

num为你想要进行填充的数字
length为你想要的数字长度
*/

//迭代方式实现
padding1=(num, length)=> {
for(let len = (num + "").length; len < length; len = num.length) {
num = "0" + num;
}
return num;
}

//递归方式实现
padding2=(num, length) =>{
if((num + "").length >= length) {
return num;
}
return padding2("0" + num, length)
}

//填充截取法
padding4=(num, length)=> {
//这里用slice和substr均可
return (Array(length).join("0") + num).slice(-length);
}

//填充截取法
padding5=(num, length)=> {
let len = (num + "").length;
let diff = length+1 - len;
if(diff > 0) {
return Array(diff).join("0") + num;
}
return num;
}
复制代码

013.格式转换：base64转file====================

/**

base64 base64
filename 转换后的文件名
/
base64ToFile = (base64, filename )=> {
let arr = base64.split(‘,‘)
let mime = arr[0].match(/难过.?);/)[1]
let suffix = mime.split(‘/‘)[1] // 图片后缀
let bstr = atob(arr[1])
let n = bstr.length
let u8arr = new Uint8Array(n)
while (n--) {
u8arr[n] = bstr.charCodeAt(n)
}
return new File([u8arr], ${filename}.${suffix}, { type: mime })
}
复制代码

014.格式转换：base64转blob====================

015.格式转换：blob转file==================

blobToFile = (blob, fileName) => {
blob.lastModifiedDate = new Date();
blob.name = fileName;
return blob;
};
复制代码

016.格式转换：file转base64====================

/**

file 图片文件
返回图片的Base64数据
*/
fileToBase64 = file => {
let reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (e) {
return e.target.result
};
}
复制代码

017.获取地址栏传递过来的参数================

/**

name为地址栏传递过来的字段名
/
getQueryString = name => {
let reg = new RegExp("(^|&)" + name + "=([^&])(&|$)");
let r = window.location.search.substr(1).match(reg);
if (r != null) return unescape(r[2]); return null;
}

// 测试
// http://localhost:3306/admin?id=111&name=xxx
// console.log(getQueryString(‘id‘)); // 111
// console.log(getQueryString(‘name‘)); // xxx
复制代码

018.对象处理为数组对象=============

/**

obj 需要处理的对象
*/
objToArrObj = obj => {
let arr = []
for(let i in obj){
arr.push({[i]:obj[i]})
}
return arr
}

// 测试数据
let obj = {20180410: 5, 20180411: 13, 20180412: 26, 20180413: 16}
console.log(objToArrObj(obj));
/*
[
{ 20180410: 5 },
{ 20180411: 13 },
{ 20180412: 26 },
{ 20180413: 16 }
]
*/

 ![手把手教你常用JS方法封装(一) [ 大杂烩 ]](http://p3.pstatp.com/large/dfic-imagehandler/a3548031-8354-4d74-a3c5-dd39f97e2390) 持续更新中...========常用JS方法封装方法预告：* 项目常用JS方法封装(二) [ 时间处理 ]* 项目常用JS方法封装(三) [ 字符串相关处理 ]* 项目常用JS方法封装(四) [ 数组相关处理 ]* * ***使用方法非常简单，只需放到你的 utils.js 工具文件中，直接 export const 加上我的封装方法，在别的文件中使用{方法1,方法2,方法3...}引用后就可以直接使用了!**001.输入一个值,返回其数据类型=================

type = para => {
return Object.prototype.toString.call(para).slice(8,-1)
}
复制代码

002.阶乘======

factorial = num => {
let count = 1;
for (let i = 1; i <= num; i++) {
count *= i;
}
return count;
}
复制代码

003.两个数之间累乘===========

004.累加======（）里面可以放N个实参

function cumsum() {
let sum = 0;
for (let i = 0; i < arguments.length; i++) {
sum += arguments[i];
}
return sum;
}
复制代码

005.计时器(计算代码块(函数)执行时间)======================**无参 computeTime(f)**

computeTime = code => {
let startTime = new Date().getTime();
code();
let endTime = new Date().getTime();
let time = endTime - startTime;
return time;
}
复制代码

**有参 computeTime(f)** 使用方法:computeTime(f,参数1,参数2......)

006.数字超过9显示省略号==============

num_filter = val =>{
val = val?val-0:0;
if (val > 9 ) {
return "…"
}else{
return val;
}
}
复制代码

007.数字超过99显示99+===============

ninenum_filter = val =>{
val = val?val-0:0;
if (val > 99 ) {
return "99+"
}else{
return val;
}
}
复制代码

008.银行卡号分割==========

bank_filter = val =>{
val += ‘‘;
val = val.replace(/(\s)/g,‘‘).replace(/(\d{4})/g,‘$1 ‘).replace(/\s*$/,‘‘);
return val;
}
复制代码

009.防抖与节流=========

/**

函数防抖 (只执行最后一次点击)
/
Debounce = (fn, t) => {
let delay = t || 500;
let timer;
return function () {
let args = arguments;
if(timer){
clearTimeout(timer);
}
timer = setTimeout(() => {
timer = null;
fn.apply(this, args);
}, delay);
}
};
/
函数节流
*/
Throttle = (fn, t) => {
let last;
let timer;
let interval = t || 500;
return function () {
let args = arguments;
let now = +new Date();
if (last && now - last < interval) {
clearTimeout(timer);
timer = setTimeout(() => {
last = now;
fn.apply(this, args);
}, interval);
} else {
last = now;
fn.apply(this, args);
}
}
};

复制代码

010.深拷贝=======

let str1 = {
arr: [1, 2, 3],
obj: {
key: ‘value‘
},
fn: function () {
return 1;
}
};
let str3 = deepClone(str1);

console.log(str3 === str1); // false
console.log(str3.obj === str1.obj); // false
console.log(str3.fn === str1.fn); // true
复制代码

011.获取视口尺寸==========**需要在HTML文件中运行**

012.数字前补零=========

/**

num为你想要进行填充的数字
length为你想要的数字长度
*/

//迭代方式实现
padding1=(num, length)=> {
for(let len = (num + "").length; len < length; len = num.length) {
num = "0" + num;
}
return num;
}

//递归方式实现
padding2=(num, length) =>{
if((num + "").length >= length) {
return num;
}
return padding2("0" + num, length)
}

//填充截取法
padding4=(num, length)=> {
//这里用slice和substr均可
return (Array(length).join("0") + num).slice(-length);
}

//填充截取法
padding5=(num, length)=> {
let len = (num + "").length;
let diff = length+1 - len;
if(diff > 0) {
return Array(diff).join("0") + num;
}
return num;
}
复制代码

013.格式转换：base64转file====================

/**

base64 base64
filename 转换后的文件名
/
base64ToFile = (base64, filename )=> {
let arr = base64.split(‘,‘)
let mime = arr[0].match(/难过.?);/)[1]
let suffix = mime.split(‘/‘)[1] // 图片后缀
let bstr = atob(arr[1])
let n = bstr.length
let u8arr = new Uint8Array(n)
while (n--) {
u8arr[n] = bstr.charCodeAt(n)
}
return new File([u8arr], ${filename}.${suffix}, { type: mime })
}
复制代码

014.格式转换：base64转blob====================

015.格式转换：blob转file==================

blobToFile = (blob, fileName) => {
blob.lastModifiedDate = new Date();
blob.name = fileName;
return blob;
};
复制代码

016.格式转换：file转base64====================

/**

file 图片文件
返回图片的Base64数据
*/
fileToBase64 = file => {
let reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (e) {
return e.target.result
};
}
复制代码

017.获取地址栏传递过来的参数================

/**

name为地址栏传递过来的字段名
/
getQueryString = name => {
let reg = new RegExp("(^|&)" + name + "=([^&])(&|$)");
let r = window.location.search.substr(1).match(reg);
if (r != null) return unescape(r[2]); return null;
}

// 测试
// http://localhost:3306/admin?id=111&name=xxx
// console.log(getQueryString(‘id‘)); // 111
// console.log(getQueryString(‘name‘)); // xxx
复制代码

018.对象处理为数组对象=============

/**

obj 需要处理的对象
*/
objToArrObj = obj => {
let arr = []
for(let i in obj){
arr.push({[i]:obj[i]})
}
return arr
}

// 测试数据
let obj = {20180410: 5, 20180411: 13, 20180412: 26, 20180413: 16}
console.log(objToArrObj(obj));
/*
[
{ 20180410: 5 },
{ 20180411: 13 },
{ 20180412: 26 },
{ 20180413: 16 }
]
*/

 ![手把手教你常用JS方法封装(一) [ 大杂烩 ]](http://p3.pstatp.com/large/dfic-imagehandler/a3548031-8354-4d74-a3c5-dd39f97e2390) 持续更新中...========常用JS方法封装方法预告：* 项目常用JS方法封装(二) [ 时间处理 ]* 项目常用JS方法封装(三) [ 字符串相关处理 ]* 项目常用JS方法封装(四) [ 数组相关处理 ]* * ***使用方法非常简单，只需放到你的 utils.js 工具文件中，直接 export const 加上我的封装方法，在别的文件中使用{方法1,方法2,方法3...}引用后就可以直接使用了!**001.输入一个值,返回其数据类型=================

type = para => {
return Object.prototype.toString.call(para).slice(8,-1)
}
复制代码

002.阶乘======

factorial = num => {
let count = 1;
for (let i = 1; i <= num; i++) {
count *= i;
}
return count;
}
复制代码

003.两个数之间累乘===========

004.累加======（）里面可以放N个实参

function cumsum() {
let sum = 0;
for (let i = 0; i < arguments.length; i++) {
sum += arguments[i];
}
return sum;
}
复制代码

005.计时器(计算代码块(函数)执行时间)======================**无参 computeTime(f)**

computeTime = code => {
let startTime = new Date().getTime();
code();
let endTime = new Date().getTime();
let time = endTime - startTime;
return time;
}
复制代码

**有参 computeTime(f)** 使用方法:computeTime(f,参数1,参数2......)

006.数字超过9显示省略号==============

num_filter = val =>{
val = val?val-0:0;
if (val > 9 ) {
return "…"
}else{
return val;
}
}
复制代码

007.数字超过99显示99+===============

ninenum_filter = val =>{
val = val?val-0:0;
if (val > 99 ) {
return "99+"
}else{
return val;
}
}
复制代码

008.银行卡号分割==========

bank_filter = val =>{
val += ‘‘;
val = val.replace(/(\s)/g,‘‘).replace(/(\d{4})/g,‘$1 ‘).replace(/\s*$/,‘‘);
return val;
}
复制代码

009.防抖与节流=========

/**

函数防抖 (只执行最后一次点击)
/
Debounce = (fn, t) => {
let delay = t || 500;
let timer;
return function () {
let args = arguments;
if(timer){
clearTimeout(timer);
}
timer = setTimeout(() => {
timer = null;
fn.apply(this, args);
}, delay);
}
};
/
函数节流
*/
Throttle = (fn, t) => {
let last;
let timer;
let interval = t || 500;
return function () {
let args = arguments;
let now = +new Date();
if (last && now - last < interval) {
clearTimeout(timer);
timer = setTimeout(() => {
last = now;
fn.apply(this, args);
}, interval);
} else {
last = now;
fn.apply(this, args);
}
}
};

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010.深拷贝=======

let str1 = {
arr: [1, 2, 3],
obj: {
key: ‘value‘
},
fn: function () {
return 1;
}
};
let str3 = deepClone(str1);

console.log(str3 === str1); // false
console.log(str3.obj === str1.obj); // false
console.log(str3.fn === str1.fn); // true
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011.获取视口尺寸==========**需要在HTML文件中运行**

012.数字前补零=========

/**

num为你想要进行填充的数字
length为你想要的数字长度
*/

//迭代方式实现
padding1=(num, length)=> {
for(let len = (num + "").length; len < length; len = num.length) {
num = "0" + num;
}
return num;
}

//递归方式实现
padding2=(num, length) =>{
if((num + "").length >= length) {
return num;
}
return padding2("0" + num, length)
}

//填充截取法
padding4=(num, length)=> {
//这里用slice和substr均可
return (Array(length).join("0") + num).slice(-length);
}

//填充截取法
padding5=(num, length)=> {
let len = (num + "").length;
let diff = length+1 - len;
if(diff > 0) {
return Array(diff).join("0") + num;
}
return num;
}
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013.格式转换：base64转file====================

/**

base64 base64
filename 转换后的文件名
/
base64ToFile = (base64, filename )=> {
let arr = base64.split(‘,‘)
let mime = arr[0].match(/难过.?);/)[1]
let suffix = mime.split(‘/‘)[1] // 图片后缀
let bstr = atob(arr[1])
let n = bstr.length
let u8arr = new Uint8Array(n)
while (n--) {
u8arr[n] = bstr.charCodeAt(n)
}
return new File([u8arr], ${filename}.${suffix}, { type: mime })
}
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014.格式转换：base64转blob====================

015.格式转换：blob转file==================

blobToFile = (blob, fileName) => {
blob.lastModifiedDate = new Date();
blob.name = fileName;
return blob;
};
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016.格式转换：file转base64====================

/**

file 图片文件
返回图片的Base64数据
*/
fileToBase64 = file => {
let reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (e) {
return e.target.result
};
}
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017.获取地址栏传递过来的参数================

/**

name为地址栏传递过来的字段名
/
getQueryString = name => {
let reg = new RegExp("(^|&)" + name + "=([^&])(&|$)");
let r = window.location.search.substr(1).match(reg);
if (r != null) return unescape(r[2]); return null;
}

// 测试
// http://localhost:3306/admin?id=111&name=xxx
// console.log(getQueryString(‘id‘)); // 111
// console.log(getQueryString(‘name‘)); // xxx
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018.对象处理为数组对象=============

/**

obj 需要处理的对象
*/
objToArrObj = obj => {
let arr = []
for(let i in obj){
arr.push({[i]:obj[i]})
}
return arr
}

// 测试数据
let obj = {20180410: 5, 20180411: 13, 20180412: 26, 20180413: 16}
console.log(objToArrObj(obj));
/*
[
{ 20180410: 5 },
{ 20180411: 13 },
{ 20180412: 26 },
{ 20180413: 16 }
]
*/

 ![手把手教你常用JS方法封装(一) [ 大杂烩 ]](http://p3.pstatp.com/large/dfic-imagehandler/a3548031-8354-4d74-a3c5-dd39f97e2390) 持续更新中...========常用JS方法封装方法预告：* 项目常用JS方法封装(二) [ 时间处理 ]* 项目常用JS方法封装(三) [ 字符串相关处理 ]* 项目常用JS方法封装(四) [ 数组相关处理 ]* * ***使用方法非常简单，只需放到你的 utils.js 工具文件中，直接 export const 加上我的封装方法，在别的文件中使用{方法1,方法2,方法3...}引用后就可以直接使用了!**001.输入一个值,返回其数据类型=================

type = para => {
return Object.prototype.toString.call(para).slice(8,-1)
}
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002.阶乘======

factorial = num => {
let count = 1;
for (let i = 1; i <= num; i++) {
count *= i;
}
return count;
}
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003.两个数之间累乘===========

004.累加======（）里面可以放N个实参

function cumsum() {
let sum = 0;
for (let i = 0; i < arguments.length; i++) {
sum += arguments[i];
}
return sum;
}
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005.计时器(计算代码块(函数)执行时间)======================**无参 computeTime(f)**

computeTime = code => {
let startTime = new Date().getTime();
code();
let endTime = new Date().getTime();
let time = endTime - startTime;
return time;
}
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**有参 computeTime(f)** 使用方法:computeTime(f,参数1,参数2......)

006.数字超过9显示省略号==============

num_filter = val =>{
val = val?val-0:0;
if (val > 9 ) {
return "…"
}else{
return val;
}
}
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007.数字超过99显示99+===============

ninenum_filter = val =>{
val = val?val-0:0;
if (val > 99 ) {
return "99+"
}else{
return val;
}
}
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008.银行卡号分割==========

bank_filter = val =>{
val += ‘‘;
val = val.replace(/(\s)/g,‘‘).replace(/(\d{4})/g,‘$1 ‘).replace(/\s*$/,‘‘);
return val;
}
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009.防抖与节流=========

/**

函数防抖 (只执行最后一次点击)
/
Debounce = (fn, t) => {
let delay = t || 500;
let timer;
return function () {
let args = arguments;
if(timer){
clearTimeout(timer);
}
timer = setTimeout(() => {
timer = null;
fn.apply(this, args);
}, delay);
}
};
/
函数节流
*/
Throttle = (fn, t) => {
let last;
let timer;
let interval = t || 500;
return function () {
let args = arguments;
let now = +new Date();
if (last && now - last < interval) {
clearTimeout(timer);
timer = setTimeout(() => {
last = now;
fn.apply(this, args);
}, interval);
} else {
last = now;
fn.apply(this, args);
}
}
};

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010.深拷贝=======

let str1 = {
arr: [1, 2, 3],
obj: {
key: ‘value‘
},
fn: function () {
return 1;
}
};
let str3 = deepClone(str1);

console.log(str3 === str1); // false
console.log(str3.obj === str1.obj); // false
console.log(str3.fn === str1.fn); // true
复制代码

011.获取视口尺寸==========**需要在HTML文件中运行**

012.数字前补零=========

/**

num为你想要进行填充的数字
length为你想要的数字长度
*/

//迭代方式实现
padding1=(num, length)=> {
for(let len = (num + "").length; len < length; len = num.length) {
num = "0" + num;
}
return num;
}

//递归方式实现
padding2=(num, length) =>{
if((num + "").length >= length) {
return num;
}
return padding2("0" + num, length)
}

//填充截取法
padding4=(num, length)=> {
//这里用slice和substr均可
return (Array(length).join("0") + num).slice(-length);
}

//填充截取法
padding5=(num, length)=> {
let len = (num + "").length;
let diff = length+1 - len;
if(diff > 0) {
return Array(diff).join("0") + num;
}
return num;
}
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013.格式转换：base64转file====================

/**

base64 base64
filename 转换后的文件名
/
base64ToFile = (base64, filename )=> {
let arr = base64.split(‘,‘)
let mime = arr[0].match(/难过.?);/)[1]
let suffix = mime.split(‘/‘)[1] // 图片后缀
let bstr = atob(arr[1])
let n = bstr.length
let u8arr = new Uint8Array(n)
while (n--) {
u8arr[n] = bstr.charCodeAt(n)
}
return new File([u8arr], ${filename}.${suffix}, { type: mime })
}
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014.格式转换：base64转blob====================

015.格式转换：blob转file==================

blobToFile = (blob, fileName) => {
blob.lastModifiedDate = new Date();
blob.name = fileName;
return blob;
};
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016.格式转换：file转base64====================

/**

file 图片文件
返回图片的Base64数据
*/
fileToBase64 = file => {
let reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (e) {
return e.target.result
};
}
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017.获取地址栏传递过来的参数================

/**

name为地址栏传递过来的字段名
/
getQueryString = name => {
let reg = new RegExp("(^|&)" + name + "=([^&])(&|$)");
let r = window.location.search.substr(1).match(reg);
if (r != null) return unescape(r[2]); return null;
}

// 测试
// http://localhost:3306/admin?id=111&name=xxx
// console.log(getQueryString(‘id‘)); // 111
// console.log(getQueryString(‘name‘)); // xxx
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018.对象处理为数组对象=============

/**

obj 需要处理的对象
*/
objToArrObj = obj => {
let arr = []
for(let i in obj){
arr.push({[i]:obj[i]})
}
return arr
}

// 测试数据
let obj = {20180410: 5, 20180411: 13, 20180412: 26, 20180413: 16}
console.log(objToArrObj(obj));
/*
[
{ 20180410: 5 },
{ 20180411: 13 },
{ 20180412: 26 },
{ 20180413: 16 }
]
*/