數組去重

    Array.prototype.unique3 = function(){
        var res = [];
        var json = {};
        for(var i = 0; i < this.length; i++){
//            alert(this[i]);
            if(!json[this[i]]){
                res.push(this[i]);
                json[this[i]] = 1;
            }
        }
        return res;
    };
    var arr = [112,112,34,'你好',112,112,34,'你好','str','str1'];
    alert(arr.unique3());