编写一个方法去掉数组里面重复的内容 var arr=['abc','abcd','sss','2','d','t','2','ss','f','22','d'];

        function noRepeat(arr) {
            var arr1 = [];
            for (var i = 0; i < arr.length; i++) {
                var item = arr[i];
                if (arr1.indexOf(item) === -1) arr1.push(item);
            }
            return arr1;
        }
        console.log(noRepeat(arr));