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">
        /**
         * 函数组件
         * 1.首字母大写 大驼峰命名法
         * 2.函数必须返回jsx
         * 3.jsx必须有一个根节点 React.Fragment
         * 不支持this
         * 单向数据流：只能从父组件传给子组件
         * props
        */
        function LinkStyle() {
            return (
                <>
                    <link rel="stylesheet" href="./css/a.css" precedence="low" />
                    <link rel="stylesheet" href="./css/b.css" precedence="high" />

                </>
            )
        }

        function Good() {
            console.log(this, 'this')
            return (
                <div>
                    <h1 className='end'>好好学习</h1>
                </div>
            )
        }
        function Welcome() {
            return (
                <React.Fragment>
                    <h1>好好学习!</h1>
                </React.Fragment>
            )
        }
        const News = () => {
            return <>
                <h2>大家好</h2>
                <h2>大家好</h2>
                <h2>大家好</h2>

                <Good />
                <Welcome />
            </>
        }
        const element = (
            <>
                <LinkStyle />
                <News />
            </>
        )
        const container = document.getElementById("root");
        const root = ReactDOM.createRoot(container)
        root.render(element);
    </script>
</body>

</html>