js 数组分割

// arr 待分割数组
// 每组多少条数据
function arrSlice(arr,num){
  let count = arr.length / num
  let new = []
  for( let i = 0; i < count; i++){
    newArr.push(arr.slice( i * num.( i + 1 ) * num))
  }
  return newArr
}