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受控组件

Category: React Tutorial: React基础 Published: 2026-04-07 13:58 Views: 20 Likes: 0 Comments: 0
23_受控组件

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>2_受控组件</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">
      //创建组件
      class Login extends React.Component {
        // 初始化状态
        state = {
          username: "", // 用户名
          password: "", // 密码
        };

        // 保存用户名到状态中
        saveUsername = (event) => {
          this.setState({ username: event.target.value });
        };

        // 保存密码到状态中
        savePassword = (event) => {
          this.setState({ password: event.target.value });
        };

        // 表单提交的回调
        handleSubmit = (event) => {
          event.preventDefault(); // 阻止表单提交
          const { username, password } = this.state;
          alert(`你输入的用户名是：${username},你输入的密码是：${password}`);
        };

        render() {
          return (
            <form onSubmit={this.handleSubmit}>
              用户名：
              <input onChange={this.saveUsername} type="text" name="username" />
              密码：
              <input
                onChange={this.savePassword}
                type="password"
                name="password"
              />
              <input type="submit" value="提交" />
            </form>
          );
        }
      }

      // 渲染组件
      ReactDOM.render(<Login />, document.getElementById("test"));
    </script>
  </body>
</html>