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React backend request data implementation method: 1. Configure ""proxy":"http://localhost:5000"" in package.json; 2. Create "setupProxy.js" in the src directory " file; 3. Call the function configured in "setupProxy.js", the code is such as "createProxyMiddleware('/api2',{target:...}".
The operating environment of this tutorial: Windows 10 system, react version 18.0.0, Dell G3 computer.
How to request data from the react backend?
react -ajax request background data method
"proxy":"http://localhost:5000"
getStudentData = () => { axios.get('/students').then( (result) => { console.log(result.data); }, (reason) => { console.log(reason); }) }
setupProxy.js
//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=${value}`).then( result => { this.props.getSearchResult(result.data.items) }, reason => { console.log(reason); }) } render() { return ( <section> <h3>搜索github用户</h3> <div> <input> this.keyWordElement = c} type="text" placeholder="enter the name you search" /> <button>搜索</button> </div> </section> ) } }
import React, { Component } from 'react' import './index.css' export default class List extends Component { render() { return ( <div> {this.props.users.map(item=>{ return <div> <a> <img alt="How to implement react backend request data" > </a> <p>{item.login}</p> </div> })} </div> ) } }
PubSubJs:
##pub:( publish) publish: It is used to implement publish and subscribe. You can see it in vue. eventBus, regarded as the carrier of the function
var token=PubSub.subscribe("myTopic",myFunction[托管的函数])//token,是当前订阅函数的唯一id,可以用来取消订阅
PubSub.publish('myTopic','需要发送给订阅者的内容')
: Add pubsub-js
yarn add pubsub-js
import PubSub from 'pubsub-js'
componentDidMount(){ this.token=PubSub.subscribe("changeState",this.changeStateObj) }
import React, { Component } from 'react' import PubSub from 'pubsub-js' import './index.css' export default class List extends Component { state={ users:[],//拿到的用户信息 isFirst:true,//是否第一次访问 isLoading:false,//是否正在加载 err:"",//返回的错误信息 } changeStateObj=(msg,value)=>{ this.setState(value) } componentDidMount(){ this.token=PubSub.subscribe("changeState",this.changeStateObj) } componentWillUnmount(){ PubSub.unsubscribe(this.token) } render() { let {users,isFirst,isLoading,err}=this.state return ( ) } }
import React, { Component } from 'react' import axios from 'axios' import './index.css' import PubSub from 'pubsub-js' export default class Search extends Component { search = () => { //获取输入框中的值 const { value } = this.keyWordElement; PubSub.publish('changeState',{isFirst:false,isLoading:true}) //发送请求 axios.get(`/api1/search/users2?q=${value}`).then( result => { PubSub.publish('changeState',{isLoading:false,users:result.data.items}) }, reason => { PubSub.publish('changeState',{isLoading:false,err:reason.message}) }) } 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 Search from './components/Search' import List from './components/List' import './App.css' export default class App extends Component { render() { return ( <div> <search></search> <list></list> </div> ) } }
let getData=async()=>{ try{ let result=await fetch(url); let data=await result.json(); }catch(error){ console.log('请求错误',error) } }recommends learning: "react video tutorial"
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