Js array cyclically traverses all elements in the array

Source: Internet
Author: User

In js, the simplest way to traverse arrays is to use for and then use arr. length as the maximum value of for. Let's take a look at some useful instances.

For example, for () {} traverses the Array

The Code is as follows: Copy code

<Script type = "text/javascript">
<! --
Var arr = new Array (13.5 );
For (var I = 0; I <arr. length; I ++ ){
Arr [I] = arr [I]/2.0;
Alert (arr );
// -->

For example, for in loop traversal Array

The Code is as follows: Copy code


<Script type = "text/javascript">
Var x
Var mycars = new Array ()
Mycars [0] = "Saab"
Mycars [1] = "Volvo"
Mycars [2] = "BMW"

For (x in mycars)
Document. write (mycars [x] + "<br/> ")


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