How to determine if an element is in an array in jquery

Jquery method to determine whether an element is in an array: You can use the [$.inArray("Element (string)", array name)] method to determine. If the element exists in the array, then this method Will return the index of the element in the array.

The operating environment of this tutorial: windows10 system, jquery2.2.4 version, suitable for all brands of computers.

Principle:

Traverse the entire array and then determine whether it is equal.

(Learning video sharing: jquery video tutorial)

Introduction to judgment method:

You can use the method provided by Jquery: $.inArray("Element (string)", array name) makes a judgment. When the element (string) exists, the subscript of the element in the array is returned. If it does not exist, -1 is returned.

Code implementation:

$(function () {
          var array = ["asp.net", "asp.net mvc", "html5", "css3", "jquery", "JavaScript"];
             var index = $.inArray("asp.net mvc", array);   //结果：index=1
            if (index >= 0) {
                console.log("数组array包含asp.net mvc下标为：" + index);
           } else {
                console.log("数组array 不包含asp.net mvc下标为：" + index);
           }
      });

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