js 截取指定字符长度 为数组

str要截取的字符

n截取个数

function jiequ(str,n) {
            var strArr = [];
            for (var i = 0, l = str.length; i < l / n; i++) {
                var a = str.slice(n * i, n * (i + 1));
                strArr.push(a);
            }
            return strArr;
        }