使用 ref 相关疑问

Question

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).

Answer 1

警告的意思是你只能对react组件添加ref，而且在生命周期render之前，也就是组件还没有被创建之前添加ref，在render及之后的生命周期可以调用到ref