React · 面试题汇总

``` <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Document</title> <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script> <script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script> <script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script> <script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script> </head> <body> <div id="example"></div> <script type="text/babel"> class Clock extends React.Component { constructor(props){ super(props); this.state = { msg:"hello world", imgUrl:"" }; } render(){ return( <div> <h1>{this.state.msg}</h1> <img src={this.state.imgUrl} /> </div> ); } componentDidMount(){ var url = "https://douban.uieee.com/v2/movie/top250"; $.ajax({ url, type:"get", dataType:"jsonp", success: res => { console.log(1); var subjects =res.subjects[0]; var title = subjects.title; var imgUrl = subjects.images.small; this.setState({ msg:title, imgUrl:imgUrl }) } }) // console.log(1); } } ReactDOM.render( <Clock />, document.getElementById('example') ); </script> </body> </html> ```