字符串、数组去重

 1         /**
 2          * 数组、字符串去重
 3          * @param  {[string/array]} as [数组或者字符串]
 4          * @return {[array]}    [返回数组]
 5          */
 6         var unique = function(as) {
 7 
 8             var obj = {};
 9 
10             for (var i = 0; i < as.length; i++) {
11 
12                 obj[as[i]] = as[i];
13 
14             }
15 
16             as = [];
17 
18             for (var index in obj) {
19 
20                 as.push(index);
21 
22             }
23 
24             return as;
25 
26         }