/*  * 输入两个非负整数，以数组形式反向排序显示，相加并返回新的数组  * Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)  * Output: 7 -> 0 -> 8  */ var addtwonumbers = function( list1, list2 ){  var resultNumberList = []  newList1 = list1.reverse().join('')  newList2 = list2.reverse().join('')  addNumber = parseInt(newList1)+ parseInt(newList2)  addString = addNumber.toString()  for( var i = 0; i < addString.length; i ++ ){    resultNumberList.push( parseInt(addString[i]) )  }  return resultNumberList.reverse()}