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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