Shulou(Shulou.com)06/01 Report--

This article mainly introduces how to use map () in JavaScript, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand.

Map ()

The map () method creates a new array, and the result is that each element in the array is the return value after calling the supplied function once.

Const numList = [1,2,3]; const square = (num) = > {return num * num} const squares = numList.map (square); console.log (squares) / / [1,4,9] what is JavaScript JS is the abbreviation of JavaScript, it is a literal scripting language, its interpreter is called JavaScript engine, is a part of the browser, mainly used for web development, can add a variety of dynamic effects to the website, make the page more beautiful.

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