js刪除數組裡重復的元數

1、返回無重復的新數組（就是原數組刪除重復的元素）
<script type="text/Javascript">
    Array.prototype.strip=function(){
        if(this.length<2) [this[0]]||[];
        var arr=[];
        for(var i=0;i<this.length;i++){
            arr.push(this.splice(i--,1));
            for(var j=0;j<this.length;j++){
                if(this[j]==arr[arr.length-1]){
                    this.splice(j--,1);
                }
            }
        }
        return arr;
    }
    var arr=["123a",85,4,,54,"123a",85,8,8,1,2,5,4,7,8,54,"44"];
    alert(arr.strip());
</script>
2、返回被刪元素組成的新數組
<script type="text/Javascript">
    Array.prototype.strip=function(){
        if(this.length<2) return [];
        var arr=[];
        var del=[];
        for(var i=0;i<this.length;i++){
            arr.push(this.splice(i--,1));
            for(var j=0;j<this.length;j++){
                if(this[j]==arr[arr.length-1]){
                &nbsp;   del.push(this.splice(j--,1));
                }
            }
        }
        return del;
    }
    var arr=["123a",85,4,,54,"123a",85,8,8,1,2,5,4,7,8,54,"44"];
    alert(arr.strip());
</script>