javascript教程系列16:數組array12

1 Array 對象

作用:Array 對象用於在變量中存儲多個值.

1.1 數組定義

var ary = new Array();//通過創建對象的方式創建數組

var ary1 = [];// 直接創建一個函數

2 賦值

數組中通過下標的方式進行賦值.下標從0開始.

var n2 = [];   //創建數組
n2[0] = 123;   //數組賦值
n2[1] = 456;

3 數組的初始化和遍歷

var n3 = [12,44,"string","字符串"];//數組的初始化

//數組的遍歷
for (var i =1;i<4;i++){
       alert(n3[i]);
}

4 數組數據的個數  length屬性

通過數組名.length獲取數組長度（元素個數）:ary.length.

var ary = [1,"string","strin","str",3,45,345,"哈哈"];
for (var i = 0; i<ary.length;i++){
      alert(ary[i]);

}

5 數組合並

使用concat方法合併數組。

var n3 = [12,44,"string","字符串"];//數組的初始化

var ary = [1,"string","strin","str",3,45,345,"哈哈"];

//數組合並
var n4 =n3.concat(ary);
alert(n4);

 結果:

6 Join 方法  返回一個字符串

Join方法返回一個字符串數組

var ary1 = [1,"string","strin","str",3,45,345,"哈哈"];
var ary2 =ary1 .join("&");
alert(ary2);
alert(typeof(ary2));

結果: