https://www.freecodecamp.org/news/react-useeffect-absolute-beginners/ 简单说就是:当前component之行完毕后会执行useEffect定义的第一个参数的函数,当dependency参数改变的时候也会重新之行useEffect的第一个函数 另一变种 userLayoutEffect():https://react.dev/reference/react/useLayoutEffect#measuring-layout-befor...
With useCallback() you also add more complexity to the code because you have to make sure the dependencies of useCallback(..., deps) march those inside the memoized callback. In conclusion, optimization costs more than not having it. Without vs With useCallback in React [With Code Examp...