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並前往https://www.designcise.com/web/tutorial/how-to-add-a-key-to-an-empty-tag-in-react

How to Add a Key to an Empty Tag in React? - Designcise

Learn how to create keyed fragments in React. ... <ul> {navItems.map((item, i) => ( // without the `key` attribute, React will trigger a ...

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