How to avoid using negative numbers for indexing in arrays by JavaScript

Editor to share with you how to avoid using negative numbers in the array to do the index, I believe that most people do not understand, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Avoid using negative numbers as indexes in arrays var numbersArray = [1 numbersArray.indexOf 2 3 4 5]; var from = numbersArray.indexOf ("foo"); / / from is equal to-1numbersArray.splice (from,2); / / will return [5]

Note that the index parameter passed to splice is not negative; when it is negative, the element is deleted from the end of the array.

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