Cannot update during an existing state transition (such as within `render` or another component's constructor). Render methods should be a pure function of props and state; constructor side-effects are an anti-pattern, but can be moved to `componentWillMount`.

Cannot update during an existing state transition (such as within `render` or another component's constructor). Render methods should be a pure function of props and state; constructor side-effects are an anti-pattern, but can be moved to `componentWillMount`.

react报这个错误的原因就是说不能再render的时候改变state的值

遇到这种情况怎么办

毫不犹豫的使用这个方法，在这里面进行更新就不会有这种问题