ReactJS:componentDidUpdate和setState的第二个参数有什么区别? [英] ReactJS: What is the difference between componentDidUpdate and the second parameter of setState?

问题描述

这两个功能之间有什么区别吗? (除了他们的论点) 那些方法似乎具有相同的触发器，不是吗?

Is there any difference between those 2 functions? (besides their arguments) It seems like those methods have the same triggers, isn't it?

感谢您的帮助:)

推荐答案

componentDidUpdate，这可能是由于以下原因之一引起的:

componentDidUpdate is called whenever the component has re-rendered, which might be caused by either:

• 状态改变
• 对forceUpdate
的调用
• 父组件重新呈现(如果是顶级组件，则重新调用React.render)

• a change in state
• a call to forceUpdate
• a parent component re-rendering (or another call to React.render in the case of the top-level component)

setState回调仅在状态转换完成且组件已重新呈现后才被调用.

The setState callback will only be called once the state transition has completed and the component has re-rendered.

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