数组去重

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