var MyComponent = React.createClass({
  handleClick: function() {
    this.refs.myTextInput.focus();
  },
  render: function() {
    return (
      

        
        
      
    );
  }
});

ReactDOM.render(
  ,
  document.body
);

通过用this.refs.myTextInput.focus();,可是页面没有效果,提示错误:

Error: addComponentAsRefTo(...): Only a ReactOwner can have refs. You might be adding a ref to a component that was not created inside a component's `render` method, or you have multiple copies of React loaded (details: https://fb.me/react-refs-must-have-owner).

求指导,谢谢