ReactJS - componentWillUpdate on parent component

Question

在React如果子组件更新（无论是道具还是状态），将调用父componentWillUpdate的componentWillUpdate吗？

Answer 1

Since a component gets its props from its parent, if its props change, then it means by definition that the parent must have rerendered. However, a component that updates its own state does not cause its parent to change in any way, and so does not trigger componentWillUpdate on its parent.