js2个数组合并并去重

 //合并并去重        function MergeArray(arr1, arr2) {            var _arr = new Array();            for (var i = 0; i < arr1.length; i++) {                if (arr1[i] != "") {                    _arr.push(arr1[i]);                }            }            for (var i = 0; i < arr2.length; i++) {                var flag = true;                for (var j = 0; j < arr1.length; j++) {                    if (arr2[i] == arr1[j]) {                        flag = false;                        break;                    }                }                if (flag && arr2[i] != "") {                    _arr.push(arr2[i]);                }            }            return _arr;        }