js将一个数组分割成二维子数组

let splitArr = (data , senArrLen)=>{
//处理成len个一组的数据
let data_len = data.length;
let arrOuter_len = data_len % senArrLen === 0 ? data_len / senArrLen : parseInt((data_len / senArrLen)+'') + 1;
let arrSec_len = data_len > senArrLen ? senArrLen : data_len;//内层数组的长度
let arrOuter = new Array(arrOuter_len);//最外层数组
let arrOuter_index = 0;//外层数组的子元素下标
// console.log(data_len % len);
for (let i = 0; i < data_len; i++) {
if (i % senArrLen === 0){
arrOuter_index++;
let len = arrSec_len * arrOuter_index;
//将内层数组的长度最小取决于数据长度对len取余，平时最内层由下面赋值决定
arrOuter[arrOuter_index-1] = new Array(data_len % senArrLen);
if(arrOuter_index === arrOuter_len)//最后一组
data_len % senArrLen === 0 ?
len = data_len % senArrLen + senArrLen * arrOuter_index :
len = data_len % senArrLen + senArrLen * (arrOuter_index - 1);
let arrSec_index = 0;//第二层数组的索引
for (let k = i; k < len; k++) {//第一层数组的开始取决于第二层数组长度*当前第一层的索引
arrOuter[arrOuter_index-1][arrSec_index] = data[k];
arrSec_index++;
}
}
}
}