js小方法积累，将一个数组按照n个一份，分成若干数组

 // 把一个数组按照一定长度分割成若干数组
 function group(array, subGroupLength) {
     let index = 0;
     let newArray = [];
     while(index < array.length) {
         newArray.push(array.slice(index, index += subGroupLength));
     }
     return newArray;
 }

 let numberArray = [1,2,3,4,5,6,7,8,9,10,11,12];;
 let groupedArray = group(numberArray, 5);
 console.log(groupedArray);

打印结果为：