数组去重

function getnotchongArray(a){
    var hash = {},
          len = a.length,
          newarry = [];    
    for(var i=0;i<len;i++){
        if(!hash[a[i]]){
            hash[a[i]] = true;
            newarry .push(a[i]);
        }  
    }
    return newarry;
}    
var arr = [1,2,3,2,1,2,3,4,5,2,2,3,1];
getnotchongArray(arr)

 1 function iskongarray(a){
 2     var newarray = [],
 3         json = {};
 4     for(var i=0;i<a.length;i++){
 5         if(a[i] == ‘‘){
 6             continue;
 7         }else{
 8             if(!json[a[i]]){
 9                 newarray.push(a[i]);
10                 json[a[i]] = true;
11             }
12         }
13     }
14     newarray.sort();
15     return newarray;
16 };
17 var arr = [‘‘,‘‘,1,3,4,‘adb‘,‘fee‘,‘sss‘,43,3,2,2,3,1];
18 console.log(iskongarray(arr));//[ 1, 2, 3, 4, 43, ‘adb‘, ‘fee‘, ‘sss‘ ]