后台服务器端

负责处理前台应用提交的请求，并向前台返回 json 数据

前台应用 负责

展现数据与用户交互

发 ajax 请求与后台应用交互

yarn add axios

/src/api/ajax.js

• /* 自定义封装 axios ---- https://github.com/axios/axios 返回值： Promise 对象*/export default function ajax(url, data={}, method="GET"){ /**** 自定义封装 Promise 对象 ****/ return new Promise((resolve, reject)=>{ let promiseAxios; if(method === "GET"){ promiseAxios = axios,get(url, {params: data}); }else if(method === "POST"){ promiseAxios = axios.post(url, data); }else{ throw new Error("方法 method 错误"); } promiseAxios.then(result=>{ resolve(result); }).catch(error=>{ console.log(error); message.error("请求出错了"); throw new Error("请求出错了"); }); });}/****async function login(){ const result= await ajax( "/login", {uName: ‘Tom‘, uPWD: ‘112233‘}, "POST" ); if(result.statue === 0){...}else{...}}****/

/src/api/login.js

• import requestLogin from "xxx"...this.props.form.validateFields(()=>{ if(error){ }else{ const result = await requestLogin(values); }}).../**** 以上写法意味着 ajax 需要进一步封装 /src/api/index.jsimport ajax from "./ajax"// export function requestLogin(data){// return ajax(“/login”, data, "POST");// }export default const requsetAPI = { login(data){ return ajax(“/login”, data, "POST"); }, addUser(data){ return ajax(“/manage/user/add”, data, "POST"); },}****/

保存 用户登录 状态

• 会话保存到内存 sessionStorage
• 永久保存到硬盘 localStorage

• import store from "store";login = async (username, password)=>{ const result= await requestAPI.login({username, password})(); if(result.statue === 0){ // yarn add store@2.0.12 store.set("user_key", result.data); }else{...}}

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