js-数组去重

<script>

// 重复

Array.prototype.unique3 = function(){
 var res = [];
 var json = {};
 console.log(this)
 for(var i = 0; i < this.length; i++){
  if(!json[this[i]]){
   res.push(this[i]);
   json[this[i]] = 1;
  }
 }
 return res;
}


function unique(arr){
    var json={};
    var res =[];

    for(var i=0;i<arr.length;i++){
        // arr[i]
        var item = arr[i];
        if(!json[item]){
            res.push(arr[i]);
            json[item]= 1;
        }

    }

    return res;

}
    var arr = [112,112,34,'你好',112,112,34,'你好','str','str1'];
    console.log(arr.unique3());
    console.log('test');
    console.log(unique(arr));




</script>