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This article mainly introduces how JavaScript avoids the negative index in the array, which has a certain reference value, and interested friends can refer to it. I hope you can learn a lot after reading this article.

Avoid negative indexing in arrays (negative indexes) var numbersArray = [1 numbersArray.indexOf ("foo"); / / from is equal to-1numbersArray.splice (from,2); / / will return [5]

Make sure that the argument when calling indexOf is not negative.

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