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Use of the unshift () method in JavaScript

Source: Internet
Author: User
Tags javascript array
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Use of the unshift () method in JavaScript

This article mainly introduces the use of the unshift () method in JavaScript. It is the basic knowledge in JS beginners. For more information, see

The unshift () method of the JavaScript array adds one or more elements to the beginning of the array and returns the new length of the array.

Syntax

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Array. unshift (element1,..., elementN );

The following is the detailed information about the parameters:

Element1,..., elementN: add the element to the front of the array.

Return Value:

Returns the length of the new array. This will return undefined (undefined) in IE browser.

Example:

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<Html>

<Head>

<Title> JavaScript Array unshift Method </title>

</Head>

<Body>

<Script type = "text/javascript">

Var arr = new Array ("orange", "mango", "banana", "sugar ");

 

Var length = arr. unshift ("water ");

Document. write ("Returned array is:" + arr );

Document. write ("<br/> Length of the array is:" + length );

 

</Script>

</Body>

</Html>

This produces the following results:

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Returned array is: water, orange, mango, banana, sugar

Length of the array is: 5

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