runoob_react/try_react_refs.html

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8" />
    <title>Hello React!</title>
    <script src="https://cdn.bootcss.com/react/15.4.2/react.min.js"></script>
    <script src="https://cdn.bootcss.com/react/15.4.2/react-dom.min.js"></script>
    <script src="https://cdn.bootcss.com/babel-standalone/6.22.1/babel.min.js"></script>
    <script src="https://cdn.bootcss.com/jquery/2.1.4/jquery.min.js"></script>
</head>

<body>
    <div id="example"></div>
     <script type="text/babel">
      var MyComponent = React.createClass({
        handleClick: function() {
          // 使用原生的 DOM API 获取焦点
          console.log('myInput', this.refs.myInput)
          this.refs.myInput.focus();
        },
        render: function() {
          //  当组件插入到 DOM 后，ref 属性添加一个组件的引用于到 this.refs
          return (
            <div>
              <input type="text" ref="myInput" />
              <input
                type="button"
                value="点我输入框获取焦点"
                onClick={this.handleClick}
              />
            </div>
          );
        }
      });

      ReactDOM.render(
        <MyComponent />,
        document.getElementById('example')
      );
    </script>
</body>

</html>