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"));
        /**
         * ref绑定：
         * 1.在定义部分：声明ref名字，来自于React.createRef()
         * 2.在元素上 需要通过 ref={名字} 进行绑定
         * 3.获取： 输出 => {current:绑定的ref元素}
        */
        const dayRef = React.createRef();
        const inpRef = React.createRef();
        function App() {
            function handleClick() {
                console.log("点击",dayRef,inpRef)
            }
            return (
                <div>
                    <h1 onClick={handleClick}>我是一个标题</h1>  
                    <Day ref={dayRef} />  
                    <input type="text" ref={inpRef} />
                </div>
            )
        }

        class Day extends React.Component {
            constructor() {
                super();
                this.state = {
                    week: "周五"
                }
            }
                render() {
                    return (
                        <p>今天是{this.state.week}</p>
                    )
                }
            }
        
        root.render(<App/>);
    </script>
</body>
</html>