報錯如下：

Warning: Can't perform a React state update on an unmounted component. 
This is a no-op, but it indicates a memory leak in your application. To fix, 
cancel all subscriptions and asynchronous tasks in the componentWillUnmount method.

原因：

react組件已經被銷毀，無法對已卸載的組件執行React狀態更新。這是一個no-op，但它表示應用程序中存在內存泄漏。

解決方案：

在組件componentWillUnmount銷毀的時候將異步方法取消

componentWillUnmount() {
  this.setState = () => false;
}