How to determine if an array contains specified elements in jquery

The jquery method to determine whether the array contains the specified element: first traverse the entire array; then determine whether they are equal. The code is [var arr = [ "xml", "html", "css", "js" ]; $.inArray("js", arr);】.

The operating environment of this tutorial: Windows 7 system, jquery version 3.2.1. This method is suitable for all brands of computers.

Jquery method to determine whether an array contains a specified element:

To determine whether an array contains a certain element, in principle, it is to traverse the entire array, and then To determine whether they are equal, the

code is as follows:

var arr = [ "xml", "html", "css", "js" ];
$.inArray("js", arr);  //返回 3,

If it is not included in the array, it returns -1;

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