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回调函数形式的ref

Category: React Tutorial: React基础 Published: 2026-04-07 13:58 Views: 20 Likes: 0 Comments: 0
19_回调函数形式的ref

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>1_字符串形式的ref</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 Demo extends React.Component {
        // 展示左侧输入框的数据
        showData = () => {
          const { input1 } = this;
          alert(input1.value);
        };

        // 展示右侧输入框的数据
        showData2 = () => {
          const { input2 } = this;
          alert(input2.value);
        };

        render() {
          // c 就是当前的节点, 赋值给 input1
          // 把这个节点放在组件实例自身上, 命名为 input1
          // 回调形式的函数, 没有this, 往上找, 就是实例自身了
          return (
            <div>
              <input
                ref={(c) => (this.input1 = c)}
                type="text"
                placeholder="点击按钮提示数据"
              />
              <button onClick={this.showData}>点我提示左侧的数据</button>
              <input
                onBlur={this.showData2}
                ref={(c) => (this.input2 = c)}
                type="text"
                placeholder="失去焦点提示数据"
              />
              &nbsp;
            </div>
          );
        }
      }

      // 渲染组件到页面
      ReactDOM.render(<Demo a="1" b="2" />, document.getElementById("test"));
    </script>
  </body>
</html>