排重

 Array.prototype.fu = function () {
            var Arr = [];
            for (var i = 0; i < this.length; i++) {
                if (Arr.indexOf(this[i]) == -1) {
                    Arr.push(this[i]);
                }
            }
            return Arr;
        }
        var q = [1, 2, 3, 3, 1];
        console.log(q.fu());