JavaScript several rent

a , how to create an array

(1) created by the object's way.

var a=new Array ();

A. Direct Assignment

var a=new Array ( element 1, Element 2, Element 3, Element 4,........)

var a=new Array ( numeric )

If there is only one element, and this element is a numeric type, then he is the length of the specified array.

And his values are undefined .

Properties of the array : Length Property

B. declaring a later assignment

var a=new Array ();

A[0]=1;

a[2]=2;

a[0]=3;

(2) the way of stealth declaration

var a=[];

A. Direct Assignment :

var a=[1,2,3,4];

B. declaring a later assignment

var a=[];

A[0]=1;

a[1]=2;

a[2]=3;

J the Avascript array can store values of any type.

Second, accessing elements of an array

Accessed through an array of ( brackets ) subscript .

Third, iterate over the elements of the array

(1) for Loop

(2) while ();

(3) for in

Iv. Classification of arrays:

1. type of subscript

A. Subscript is the type of the number ( indexed array )

B. The subscript is a string type ( associative array )

2. dimensions to classify

A. one-dimensional arrays

B. two-dimensional arrays

Declare a two-dimensional array :

var arr=[[1,2,3],[4,5,6]];

This article is from the "Mr.zhu-Technology Exchange" blog, please be sure to keep this source http://bjishu.blog.51cto.com/7481301/1671812

JavaScript several rent