How to find whether a specified element exists in an array in JavaScript

JavaScript method to find whether a specified element exists in an array: 1. Use jQuery, the code is [jQuery.inArray( value, array [, fromIndex] )]; 2. Use the [indexOf()] method to return a certain a specified string value.

The operating environment of this tutorial: Windows 7 system, JavaScript version 1.8.5, DELL G3 computer.

JavaScript method to find whether a specified element exists in an array:

1.jQuery

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

• value

  Type: Anything

  The value to find.

• array

  Type: Array

  An array through which to search.

• fromIndex

  Type: Number

  Array index value, indicating where to start searching. The default value is 0, which will search the entire array.

• $.inArray() method is similar to JavaScript's native .indexOf() method. It returns -1 when no matching element is found. If the first element of the array matches value (parameter), then $.inArray() returns 0.

2.indexof

The indexOf() method returns the position where a specified string value first appears in the string.

Grammar

 stringObject.indexOf(searchvalue,fromindex)

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