import React from "react"; import ReactDOM from "react-dom"; class App extends React.Component { constructor(props) { super(props); this.state = {x: 1} } onClick = ()=>{ this.setState({ x: this.state.x + 1 }) } render(){ return App +1 <B name={this.state.x}></B> ...
const A = React.createClass({ render() { return ( hi ) } }) export default A // 由于ES5不支持class,才会有这种方式 第2种.ES6方式(推荐) import React from 'react'; class B extends React.Component { constructor(props) { super(props); } render() { return ( hi ) } } export default...
React的计算属性 直接在属性前面写一个get就是获取当前属性也就是计算属性 interfaceState{firstName:string;lastName:string;}classApp extends React.Component<Props,State>{constructor(props){super(props)this.state={firstName:'Wang',lastName:'lifa'}}getname(){returnthis.state.firstName+this.state.lastNa...
importReactfrom"react";importReactDOMfrom"react-dom";interfaceProps{message:string;}interfaceState{n:number;}classAppextendsReact.Component<Props,State>{constructor(props){super(props);this.state={n:1};}onClickN=()=>{this.setState({n:2});};render(){return(n:{this.state.n}+1);}}ReactD...
React class & function component 的区别 React class class App extends React.Component { constructor(props) { super(props);this.state ={ } } render() {return() } } function component functionApp(props) {return() }
class App extends React.Component { constructor(props){ super(props) this.state = {x : 1} } onClick = () => { this.setState({ x: this.state.x + 1 }) } render(){ return ( App +1 <B name={this.state.x}/> ); } } class B extends React.Component...
class App extends React.Component { constructor(props){ super(props) this.state = {x : 1} } onClick = () => { this.setState({ x: this.state.x + 1 }) } render(){ return ( App +1 <B name={this.state.x}/> ); } } class B extends React.Component...
classAppextendsReact.Component{state={value:"",keywords:[],};search=debounce((value)=>{this.setState({keywords:newArray(parseInt(Math.random()*10)+1).fill(0).map((i,index)=>`${value}_${index}`),});},3000);onChange=(e)=>{constvalue=e.target.value;this.setState({value});this....
class HelloWorld extends React.Component { render(){ return (Hello world!); } } ReactDOM.render(<HelloWorld/>,document.querySelector("#container")); 0 回复 收起回答 _天下_ 2018-08-01 createClass是低版的创建组件方式,高版(react4版)是使用class的方式创建组件,就创建组件这一块,低版兼容...
}exportdefaultApp; 2.2、class组件 React.Component是以ES6的形式来创建react的组件的,是React目前极为推荐的创建有状态组件的方式,形式改为React.Component形式如下 importReactfrom'react';//定义一个React组件classAppextendsReact.Component{render(){return(Hello,Reactjs!!); } }exportdefault...