2數組做對比，沒有的用0佔位

arrList = ["1","2","3","4","5","6","7","8","9","10"]
array = ["8","9"]
function sortNumber(a,b) {
  return a -b
}
for (var i=0;i<arrList.length;i++){
  if (array[i] !=arrList[i]){
	 console.log(i);
   array.splice(i, 0, "0");
  }
}
console.log('對比後返回的數組----:',array);

運行結果