How to check if there is a specified value in an array with jquery?

In jquery, you can use the "$.inArray()" method to query whether there is a value in the array. This method can search for the specified value in the array and return the index value of the specified value in the array. If the specified value does not exist in the array, "-1" is returned; syntax "$.inArray(value,array)".

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jquery determines whether the specified value exists in the array The value method $.inArray()

##$.inArray() method is used to search for the specified value in the array and returns the index value of the specified value in the array. If the array If the specified value does not exist, -1 is returned.

Syntax

$.inArray( value, array [, fromIndex ] )

Parameters:

• value Any type The value used for the search.

• array Array type specifies the array to be searched.

• fromIndex Optional. The Number type specifies that the search starts from the specified index position of the array. The default is 0

Example 1:Return the index value

var arrayStr = ['a','b','c'];
alert($.inArray('a', arrayStr));

The return index value is

0

Example 2: Judge whether the specified value exists

var arrayStr = ['a','b','c'];
if($.inArray(&#39;a&#39;,arrayStr) < 0){
    alert(&#39;不存在&#39;);
}else{
    alert(&#39;存在&#39;);
}

PS: The index value in js starts from subscript 0, if it is -1 It means that the element does not exist in the array

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