js一维数组转二维数组

var arr = [0,1,2,3,4,5,6,7,8,9,10];
var NewArray = [];
arr.forEach(item, index){
  var page = Math.floor(index/8);
  if(!NewArray[page]){
     NewArray[page] = [];
  }
  NewArray[page].push(item);
}
console.log(NewArray)