js 数组去重

 1 function unique(arr) {
 2     var result = [], isRepeated;
 3     for (var i = 0, len = arr.length; i < len; i++) {
 4         isRepeated = false;
 5         for (var j = 0, len = result.length; j < len; j++) {
 6             if (arr[i] == result[j]) {   
 7                 isRepeated = true;
 8                 break;
 9             }
10         }
11         if (!isRepeated) {
12             result.push(arr[i]);
13         }
14     }
15     return result;
16 }