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 <Good/>
        }
        class Good extends React.Component {
            // 构造器 用于实例初始化
            constructor(props) {
                // 接受父组件传递的参数
                super(props);
                // 给类组件添加状态
                // 通过this访问当前创建的实例 但是 一定要在super函数后才可以
                // 相当于Vue中的data属性
                this.state = {
                    type: '晴天'
                };
            }
            render () {
                return (
                    <div>
                        <p>{this.state.type}</p>
                    </div>
                )
            }
        }
        root.render(<App/>);
    </script>

</body>

</html>