1 Array 对象
作用:Array 对象用于在变量中存储多个值.
1.1 数组定义
var ary = new Array();//通过创建对象的方式创建数组
var ary1 = [];// 直接创建一个函数
2 赋值
数组中通过下标的方式进行赋值.下标从0开始.
var n2 = []; //创建数组
n2[0] = 123; //数组赋值
n2[1] = 456;
3 数组的初始化和遍历
var n3 = [12,44,"string","字符串"];//数组的初始化
//数组的遍历
for (var i =1;i<4;i++){
alert(n3[i]);
}
4 数组数据的个数 length属性
通过数组名.length获取数组长度(元素个数):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 数组合并
使用concat方法合并数组。
var n3 = [12,44,"string","字符串"];//数组的初始化
var ary = [1,"string","strin","str",3,45,345,"哈哈"];
//数组合并
var n4 =n3.concat(ary);
alert(n4);
结果:
6 Join 方法 返回一个字符串
Join方法返回一个字符串数组
var ary1 = [1,"string","strin","str",3,45,345,"哈哈"];
var ary2 =ary1 .join("&");
alert(ary2);
alert(typeof(ary2));
结果: