How to use regularization to realize array flattening in JavaScript

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Array flattening refers to changing a multi-dimensional array into an one-dimensional array.

Const arr = [1, [2, [3, [4, 5]], 6]; / / = > [1, 2, 3, 4, 5, 6] make use of regular const res2 = JSON.stringify (arr). Replace (/\ [|\] / g,''). Split (',')

But all data types become strings.

What are the characteristics of JavaScript? 1. Js belongs to an explanatory scripting language. 2. With the support of most browsers, js can run on multiple platforms and has cross-platform characteristics. 3. Js is a weakly typed scripting language that does not make strict requirements on the data types used. It is able to type conversion, simple and easy to use. 4. Js language is highly secure, and it can only browse information or interact dynamically through the browser, so as to effectively prevent the loss of data. 5, object-based scripting language, js can not only create objects, but also use existing objects.

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