<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./node_modules/react/umd/react.development.js"></script>
    <script src="./node_modules/react-dom/umd/react-dom.development.js"></script>
    <script src="./node_modules/babel-standalone/babel.min.js"></script>
</head>
<body>
<div id="demoReact">

</div>
<script type="text/babel">
 class MyCom extends  React.Component{
     render(){
         return(
             <div>类组件</div>
         )
     }
 }
 let com=<MyCom/>
    ReactDOM.render(com,document.getElementById('demoReact'))
</script>
</body>
</html>

运行结果