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JavaScript React Ref Callback Demo

在当前的React中，使用字符串形式的ref已经不再推荐使用，替代品是传入一个function， 以参数的形式拿到相应的component instance的值，保存起来供后续使用。

虽然React已经提供了createRef和useRef等来简化，但是使用ref callback有一个作用 是它们替代不了的：就是如这个Demo中所示，当我们需要在ref改变的时候做些事情，只能使用这种callback

npm install
npm run demo

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