// 原生js
document.getElementById(‘btn‘).addEventListener(‘click‘, function (event) {
event = event || window.event；
if (event.preventDefault){
// w3c方法 阻止默认行为
event.preventDefault();
} else{
// ie 阻止默认行为
event.returnValue = false;
}
}, false);
// jQuery
$(‘#btn‘).on(‘click‘, function (event) {
event.preventDefault();
});
// 原生js
document.getElementById(‘btn‘).addEventListener(‘click‘, function (event) {
event = event || window.event；
if (event.stopPropagation){
// w3c方法 阻止冒泡
event.stopPropagation();
} else{
// ie 阻止冒泡
event.cancelBubble = true;
}
}, false);
// jQuery
$(‘#btn‘).on(‘click‘, function (event) {
event.stopPropagation();
});
$(‘#content‘).on("mousewheel DOMMouseScroll", function (event) {
// chrome & ie || // firefox
var delta = (event.originalEvent.wheelDelta && (event.originalEvent.wheelDelta > 0 ? 1 : -1)) || (event.originalEvent.detail && (event.originalEvent.detail > 0 ? -1 : 1));
if (delta > 0) {
// 向上滚动
console.log(‘mousewheel top‘);
} else if (delta < 0) {
// 向下滚动
console.log(‘mousewheel bottom‘);
}
});
function isSupportSVG() {
var SVG_NS = ‘http://www.w3.org/2000/svg‘;
return !!document.createElementNS &&!!document.createElementNS(SVG_NS, ‘svg‘).createSVGRect;
}
// 测试
console.log(isSupportSVG());
function isSupportCanvas() {
if(document.createElement(‘canvas‘).getContext){
return true;
}else{
return false;
}
}
// 测试，打开谷歌浏览器控制台查看结果
console.log(isSupportCanvas());
function isWeiXinClient() {
var ua = navigator.userAgent.toLowerCase();
if (ua.match(/MicroMessenger/i)=="micromessenger") {
return true;
} else {
return false;
}
}
// 测试
alert(isWeiXinClient());
$(‘#myImage‘).click(function(event){
//获取鼠标在图片上的坐标
console.log(‘X：‘ + event.offsetX+‘\n Y:‘ + event.offsetY);
//获取元素相对于页面的坐标
console.log(‘X：‘+$(this).offset().left+‘\n Y:‘+$(this).offset().top);
});
html
<input id="send" type="button" value="发送验证码">
js
// 原生js版本
var times = 60, // 临时设为60秒
timer = null;
document.getElementById(‘send‘).onclick = function () {
// 计时开始
timer = setInterval(function () {
times--;
if (times <= 0) {
send.value = ‘发送验证码‘;
clearInterval(timer);
send.disabled = false;
times = 60;
} else {
send.value = times + ‘秒后重试‘;
send.disabled = true;
}
}, 1000);
}
// jQuery版本
var times = 60,
timer = null;
$(‘#send‘).on(‘click‘, function () {
var $this = $(this);
// 计时开始
timer = setInterval(function () {
times--;
if (times <= 0) {
$this.val(‘发送验证码‘);
clearInterval(timer);
$this.attr(‘disabled‘, false);
times = 60;
} else {
$this.val(times + ‘秒后重试‘);
$this.attr(‘disabled‘, true);
}
}, 1000);
});
//匹配字母、数字、中文字符
/^([A-Za-z0-9]|[\u4e00-\u9fa5])*$/
//验证邮箱
/^\w+@([0-9a-zA-Z]+[.])+[a-z]{2,4}$/
//验证手机号
/^1[3|5|8|7]\d{9}$/
//验证URL
/^http:\/\/.+\./
//验证身份证号码
/(^\d{15}$)|(^\d{17}([0-9]|X|x)$)/
//匹配中文字符的正则表达式
/[\u4e00-\u9fa5]/
//匹配双字节字符(包括汉字在内)
/[^\x00-\xff]/
function formatDate(now) {
var y = now.getFullYear();
var m = now.getMonth() + 1; // 注意js里的月要加1
var d = now.getDate();
var h = now.getHours();
var m = now.getMinutes();
var s = now.getSeconds();
return y + "-" + m + "-" + d + " " + h + ":" + m + ":" + s;
}
var nowDate = new Date(2016, 5, 13, 19, 18, 30, 20);
console.log(nowDate.getTime()); // 获得当前毫秒数: 1465816710020
console.log(formatDate(nowDate));
html
<input id="txt" type="text">
js
//字符串截取
function getByteVal(val, max) {
var returnValue = ‘‘;
var byteValLen = 0;
for (var i = 0; i < val.length; i++) {
if (val[i].match(/[^\x00-\xff]/ig) != null) byteValLen += 2; else byteValLen += 1;
if (byteValLen > max) break;
returnValue += val[i];
}
return returnValue;
}
$(‘#txt‘).on(‘keyup‘, function () {
var val = this.value;
if (val.replace(/[^\x00-\xff]/g, "**").length > 14) {
this.value = getByteVal(val, 14);
}
});
var browser = {
versions: function() {
var u = navigator.userAgent;
return {
trident: u.indexOf(‘Trident‘) > -1, //IE内核
presto: u.indexOf(‘Presto‘) > -1, //opera内核
webKit: u.indexOf(‘AppleWebKit‘) > -1, //苹果、谷歌内核
gecko: u.indexOf(‘Firefox‘) > -1, //火狐内核Gecko
mobile: !!u.match(/AppleWebKit.*Mobile.*/), //是否为移动终端
ios: !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), //ios
android: u.indexOf(‘Android‘) > -1 || u.indexOf(‘Linux‘) > -1, //android
iPhone: u.indexOf(‘iPhone‘) > -1 , //iPhone
iPad: u.indexOf(‘iPad‘) > -1, //iPad
webApp: u.indexOf(‘Safari‘) > -1 //Safari
};
}
}
if (browser.versions.mobile() || browser.versions.ios() || browser.versions.android() || browser.versions.iPhone() || browser.versions.iPad()) {
alert(‘移动端‘);
}
//它返回一个对象，其中包含了left、right、top、bottom四个属性
var myDiv = document.getElementById(‘myDiv‘);
var x = myDiv.getBoundingClientRect().left;
var y = myDiv.getBoundingClientRect().top;
// 相当于jquery的： $(this).offset().left、$(this).offset().top // js的：this.offsetLeft、this.offsetTop
function fullscreen(element) {
if (element.requestFullscreen) {
element.requestFullscreen();
} else if (element.mozRequestFullScreen) {
element.mozRequestFullScreen();
} else if (element.webkitRequestFullscreen) {
element.webkitRequestFullscreen();
} else if (element.msRequestFullscreen) {
element.msRequestFullscreen();
}
}
fullscreen(document.documentElement);
// querySelector() 返回匹配到的第一个元素
var item = document.querySelector(‘.item‘);
console.log(item);
// querySelectorAll() 返回匹配到的所有元素，是一个nodeList集合
var items = document.querySelectorAll(‘.item‘);
console.log(items[0]);
