getStudentData = () => {
    axios.get('/students').then(
      (result) => { console.log(result.data); },
      (reason) => { console.log(reason); })
  }

//const proxy=require("http-proxy-middleware")   :视频中请求的包，引用它出现了无法访问的问题//应该使用以下写法*******const { createProxyMiddleware } = require("http-proxy-middleware");module.exports=function(app){
    app.use(
        createProxyMiddleware('/api1',{//遇见/api1前缀的请求，就会触发该代理配置
            target:"http://localhost:5000",//请求转发给谁
            changeOrigin:true,//控制服务器收到的请求头中Host字段的值：host就是主机名+端口号
            	//true:后端接收到的host：localhost:5000
            	//false:后端接收到的host：localhost:3000
            	//系统默认为false，一般会设为true
            pathRewrite:{"^/api1":""}//重写请求路径（必须要写）
            //不写：后台接收到的请求路径：/api1/student
            //写了：后台请求的路径：/student
        }),
        createProxyMiddleware('/api2',{
            target:"http://localhost:5001",
            changeOrigin:true,
            pathRewrite:{"^/api2":""}
        }),
    )}

import React, { Component } from 'react'
import Search from './components/Search'
import List from './components/List'
import './App.css'

export default class App extends Component {
state={users:[]}
getSearchResult=(result)=>{
  this.setState({users:result})
}

  render() {
    return (
      <div>
        <search></search>
        <list></list>
      </div>
    )
  }
}

import React, { Component } from 'react'
import axios from 'axios'
import './index.css'

export default class Search extends Component {

  search = () => {
    //获取输入框中的值
    const { value } = this.keyWordElement;
    //发送请求
    axios.get(`/api1/search/users?q=${value}`).then(
      result => {
        this.props.getSearchResult(result.data.items)
      },
      reason => {
        console.log(reason);
      })
  }



  render() {
    return (
      <section>
        <h3>搜索github用户</h3>
        <div>
          <input> this.keyWordElement = c} type="text" placeholder="enter the name you search" /> <button>搜索</button>
        </div>
      </section>
    )
  }
}

import React, { Component } from 'react'

import './index.css'
export default class List extends Component {
  render() {
    return (
      <div>
        {this.props.users.map(item=>{
            return    <div>
                <a>
                  <img  alt="How to implement react backend request data" >
                </a>
                <p>{item.login}</p>
              </div>
        })}
  
       
      </div>  
    )
  }
}

yarn add pubsub-js

import PubSub from 'pubsub-js'

  componentDidMount(){
    this.token=PubSub.subscribe("changeState",this.changeStateObj)
  }