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This article mainly shows you "JavaScript how to use arr.includes function", the content is easy to understand, clear, hope to help you solve doubts, the following let Xiaobian lead you to study and learn "JavaScript how to use arr.includes function" this article.

Arr.includes: used to determine whether an array contains a specified value. If true is returned, otherwise false is returned. You can specify the location to start the query.

Array.prototype.includes = Array.prototype.includes | | function includes (value, start) {let ctx = this; let length = ctx.length; start = parseInt (start) if (isNaN (start)) {start = 0} else if (start)

Length? 0: (length + start);} let index = ctx.indexOf (value); return index > = start;} what are the characteristics of JavaScript? 1. Js is an interpretive scripting language; 2. With the support of most browsers, js can run on multiple platforms and has cross-platform features. 3. Js belongs to a weak type scripting language, which does not make strict requirements for the data types used, and can convert types, which is simple and easy to use; 4. Js language has high security, and it can only browse information or interact dynamically through the browser, thus effectively preventing the loss of data; 5, object-based scripting language, js can not only create objects, but also use existing objects.

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