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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title></title>
- <meta charset="UTF-8">
- <meta name="viewport" content="width=device-width, initial-scale=1">
- <!-- 将jsx转为js -->
- <script src="./babel.min.js"></script>
- <!-- react核心库 -->
- <script src="./react.development.js"></script>
- <!-- react中dom操作库 -->
- <script src="./react-dom.development.js"></script>
- </head>
- <body>
- <div id="root"></div>
- <div id="btn">这是一个按钮</div>
- <!-- type="text/babel"
- 告诉babel库 将jsx转成js
- this指向：
- 方法中 this指向当前标签
- 改变this指向方法
- 1.bind
- 2.箭头函数 ()=>{}
- -->
- <script type="text/babel">
- function onClick(){
- console.log(this)
- }
- // 第一种
- document.getElementById("btn").onclick = onClick;
- var aaaa = {name:"My name is Tutu"};
- // 改变this指向：call bind apply
- // 第二种
- let element = <div onClick={onClick.bind(aaaa)}>这是第二个按钮</div>
- let newPage = ReactDOM.createRoot(document.querySelector("#root"));
- newPage.render(element)
- </script>
- </body>
- </html>
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