lovecoding
/
W250913


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

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./babel.min.js"></script>
    <script src="./react.development.js"></script>
    <script src="./react-dom.development.js"></script>
</head>

<body>
    <div id="root"></div>
    <script type="text/babel">
        /*
         * 单向数据流：只能从父组件传给子组件
         * props 只读 不可修改
         * 没有this 没有生命周期
         * */
        function Parent() {
            return (
                <div>
                    <h1>你好</h1>
                    <hr />
                    <hr />
                    <Child name='图图' age={3} header={<h2>我是子元素的头部</h2>} />
                </div>
            )
        }
        // function Child({ name, age, header }) {
        //     return (
        //         <div>
        //             {header}
        //             <p>我叫{name},今年{age}岁</p>
        //         </div>
        //     )
        // }
        function Child(props) {
            // props.age +
            console.log(props, '111')
            return (
                <div>
                    {props.header}
                    <p>我叫{props.name},今年{props.age}岁</p>
                </div>
            )
        }
        const element = <Parent />
        const container = document.getElementById("root");
        const root = ReactDOM.createRoot(container)
        root.render(element);
    </script>
</body>

</html>