//将一个数组等分成多个数组
function group(array, subGroupLength) {
//数组,一组有多少个数据
let index = 0;
let newArray = [];
while(index < array.length) {
newArray.push(array.slice(index, index += subGroupLength));
}
return newArray;
}
var arr = [1,2,3,4,5,6,7,8,9]