js的数组申明

 1 //数组的3种申明方法,如下example
 2 //数组是一种object类型 通过typeof 来检查

 3 
 4 //example 1
 5 var arr= new Array("h","k","M","c");
 6 
 7 console.log(typeof arr);//object
 8 for( var i in arr){
 9     console.log(arr[i]);
10 }
11 
12 
13 
14 //example 2
15 var arr1=Array("hello","你好","大海");
16 console.log(typeof arr1);//object
17 for( var i in arr1){
18     console.log(arr1[i]);
19 }
20 
21 
22 //example 3
23 var arr3=["hello","你好","大海"];
24 console.log(typeof arr3);//object
25 for(var i in arr3){
26     console.log(arr3[i]);
27 }
28 
29 //example 二维数组
30 var arr4=["hello","你好","大海"]
31     arr4[0]=['这是哪里'];
32     
33     console.log(arr4[0][0]);