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並前往https://www.quora.com/How-do-you-check-if-a-key-exists-in-an-array-in-JavaScript

How do you check if a key exists in an array in JavaScript?

You can use in operator to check whether the particular key exists in an array or not. for example: [code]0 in [10, 42] // true 2 in [10, ...

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