在控件声明 ref 报错
eg.
Uncaught 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).
求解答 !
估计是我没继承 extends React.Component 造成的, 已经解决!