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並前往https://www.quora.com/In-JavaScript-why-is-it-bad-to-use-for-in-loop-for-an-array-and-what-is-an-enumerable-property

In JavaScript, why is it bad to use for/in loop for an array, and ...

Use for loops to iterate through arrays. The enumerable properties are just all the key-value pairs inside the Javascript object such as age: 12 or color: ...

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