lovecoding
/
web0715


			
				
					
						
						
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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>
    <!-- jsx 语法浏览器不识别 jsx => js 浏览器可识别的语言 -->
    <script src="./babel.min.js"></script>
    <!-- react的核心库 -->
    <script src="./react.development.js"></script>
    <!-- 解析react中的dom库 -->
    <script src="./react-dom.development.js"></script>
  </head>
  <body>
    <div id="root"></div>
    <script type="text/babel">
      let root = ReactDOM.createRoot(document.getElementById("root"));
      function App() {
        return <List />;
      }
      class List extends React.Component {
        constructor() {
          super();
          this.state = {
            list: ["图图", "哆啦A梦", "喜羊羊", "光头强"],
          };
        }
        // 循环：for / while / do while / for in /for of / forEach / map
        render() {
            // render函数 可以处理所有的js逻辑
            const {list} = this.state;
           const newsList = list.map((element,index) => <li key={index}>{index+1}-{element}</li>)

          return <div>
                <ul>
                    {/* jsx 语法  自动解析 */}
                    {newsList}  
                </ul>
            </div>;
        }
      }
      root.render(<App />);
    </script>
  </body>
</html>