js除去データ重複データ

       Array.prototype.distinct = function() {
		        var ret = [];
		        for (var i = 0; i < this.length; i++) {
		         for (var j = i+1; j < this.length;) {
		             if (this[i].id === this[j].id) {
		                 ret.push(this.splice(j, 1)[0]);
		             } else {
		                 j++;
		             }
		         }
		        }
		        return ret;
	}