小编lei*_*ing的帖子

class Sample extends React.Component {

  onInputFocus(event) {
    console.log('react input focus')
  }

  onSpanFocus(event) {
    console.log('react span focus')
      // event.stopPropagation()
  }

  render() {
    return ( <span onFocus = {this.onSpanFocus}>
      react input: <input type="text"
      onFocus = {this.onInputFocus} />
      </span> )
  }
}

ReactDOM.render( < Sample / > ,
  document.getElementById('container')
);

<div id="container">
  <!-- This element's contents will be replaced with your component. -->
</div>

<div>
  <span onfocus="(function(){console.log('normal span')})()">
  normal input:<input type="text" onfocus="(function(){console.log('normal input focus')})()">
</span>
</div>