// 一维数组
var arr1 = [‘1‘,‘2‘,‘3‘];

var arr2 = new Array(‘1‘,‘2‘,‘3‘);

var arr3 = new Array();    
arr3[0] = ‘1‘;
arr3[1] = ‘2‘;
arr3[2] = ‘3‘;

// 字符串可以作为数组的索引, 遍历的时候需要用 for-each        
var arr4 = new Array();    
arr3[‘一‘] = ‘1‘;
arr3[‘二‘] = ‘2‘;
arr3[‘三‘] = ‘3‘;            

// 二维数组
var arr5 = new Array();
arr5[0] = [‘1‘,‘2‘,‘3‘];
arr5[1] = [‘4‘,‘5‘,‘6‘];

var arr = [‘1‘,‘2‘,‘3‘];

for (var i=0; i<arr.length; i++) {
    alert(arr[i]);
}

// for-each
for (var i in arr) {
    alert(arr[i]);
}