index3.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-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>
    <!-- 
        创建节点
     -->
    <div id="demoReact">

    </div>
    <script type="text/babel">
        {/*使用表达式*/}
        let text= '歌谣';
    let num=10;
    function fun(obj)
    { return `姓名是${obj.name}"-----"年龄是${obj.age}` }
        let user={ name:"小明", age:18 }
        let myDom=(
        <div>
            <div>{text}</div>
            <div>{num}</div>
            <div>{num+1}</div>
            <div>{fun(user)}</div>
        </div>
        ) ; ReactDOM.render(myDom,document.getElementById('demoReact'))
    </script>
</body>

</html>