lovecoding
/
w1020


			
				
					
						
						
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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">
        const root = ReactDOM.createRoot(document.getElementById("root"));
        function App() {
            return (
                <div>
                    <List/>
                </div>
            )
        }
        class List extends React.Component {
            constructor() {
                super();
                this.state = {
                    list:[1,2,3,4]
                }
            }
            render() {
                let {list} = this.state;
                let l1 = list.map((item,index) => <li key={index}>{item}</li>)
                return (
                    <div>
                        {/*
                            <ul>
                                <li>1</li>
                                <li>2</li>
                                <li>3</li>
                                <li>4</li>
                            </ul>       
                        */} 
                        <ul>
                            {l1}
                        </ul>
                    </div>
                )
            }
        }
        root.render(<App />);
    </script>
</body>

</html>