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@@ -0,0 +1,53 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <script src="./babel.min.js"></script>
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+ <script src="./react.development.js"></script>
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+ <script src="./react-dom.development.js"></script>
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+</head>
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+<body>
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+ <div id="root"></div>
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+ <script type="text/babel">
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+ const root = ReactDOM.createRoot(document.getElementById("root"));
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+ /**
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+ * ref绑定：
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+ * 1.在定义部分：声明ref名字，来自于React.createRef()
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+ * 2.在元素上 需要通过 ref={名字} 进行绑定
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+ * 3.获取： 输出 => {current:绑定的ref元素}
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+ */
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+ const dayRef = React.createRef();
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+ const inpRef = React.createRef();
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+ function App() {
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+ function handleClick() {
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+ console.log("点击",dayRef,inpRef)
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+ }
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+ return (
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+ <div>
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+ <h1 onClick={handleClick}>我是一个标题</h1>
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+ <Day ref={dayRef} />
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+ <input type="text" ref={inpRef} />
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+ </div>
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+ )
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+ }
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+
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+ class Day extends React.Component {
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+ constructor() {
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+ super();
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+ this.state = {
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+ week: "周五"
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+ }
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+ }
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+ render() {
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+ return (
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+ <p>今天是{this.state.week}</p>
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+ )
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+ }
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+ }
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+
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+ root.render(<App/>);
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+ </script>
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+</body>
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+</html>
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郑柏铃