问题描述
是否曾经有一种情况，即使在React中更新了props，componentDidUpdate也不会触发?
Is there ever a situation where componentDidUpdate would NOT fire, even if the props updated in React?
推荐答案
有3种情况可能导致componentDidUpdate无法启动:
There are 3 conditions that can cause componentDidUpdate to not fire:
1)您编写了一个返回false的自定义shouldComponentUpdate.
1) You wrote a custom shouldComponentUpdate that returned false.
2)内部react方法确定虚拟DOM中没有变化，因此选择不重新渲染.
2) The internal react methods determined that there was no change in the virtual DOM, so it chose not to re-render.
3)您扩展了React.Component之外的其他内容(例如PureComponent)，该扩展具有默认的shouldComponentUpdate方法，该方法返回false.
3) You extended something other than React.Component (such as PureComponent) which has a default shouldComponentUpdate method that returned false.
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