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並前往https://javascript.tutorialink.com/how-to-use-useref-hook-properly-in-react-functional-component/

How to use useRef hook properly in react Functional ...

function fixNav() {. 5. if (window.scrollY > nav.offsetHeight) {. 6. nav.classList.add('active');. 7. } else {. 8. nav.classList.remove('active');.

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