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state的简写方式

Category: React Tutorial: React基础 Published: 2026-04-07 13:58 Views: 20 Likes: 0 Comments: 0

12_state 的简写方式

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>state简写方式</title>
  </head>
  <body>
    <!-- 准备好一个"容器" -->
    <div id="test"></div>

    <!-- 引入react核心库 -->
    <script type="text/javascript" src="./js/react.development.js"></script>

    <!-- 引入react-dom, 用于支持react操作DOM -->
    <script
      type="text/javascript"
      src="./js/react-dom.development.js"
    ></script>

    <!-- 引入babel, 用于将jsx转为js -->
    <script type="text/javascript" src="./js/babel.min.js"></script>

    <script type="text/babel">
      // 1.创建组件
      class Weather extends React.Component {
        // 初始化状态
        state = { isHot: false, wind: "微风" };

        render() {
          const { isHot, wind } = this.state;
          return (
            <h1 onClick={this.changeWeather}>
              今天天气很{isHot ? "炎热" : "凉爽"}, {wind}
            </h1>
          );
        }

        // 自定义方法————要用赋值语句的形式+箭头函数
        changeWeather = () => {
          const isHot = this.state.isHot;
          this.setState({ isHot: !isHot });
        };
      }

      // 2.渲染组件到页面
      ReactDOM.render(<Weather />, document.getElementById("test"));
    </script>
  </body>
</html>