Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)Output: 7 -> 0 -> 8Explanation: 342 + 465 = 807. 关键是获取最后一个node节点

/** * Definition for singly-linked list. * function ListNode(val) { *     this.val = val; *     this.next = null; * } *//** * @param {ListNode} l1 * @param {ListNode} l2 * @return {ListNode} */function listNode(val) {    this.val = val;    this.next = null;}var addTwoNumbers = function(l1, l2) {    var addp=l1,addn=l2,addpArr=[],addnArr=[],result;    while(addp){        addpArr.push(addp.val);        addp=addp.next;    }    while(addn){        addnArr.push(addn.val);        addn=addn.next;    }	debugger    var resultArr=[];	for(var j=0;j
     
      =10&&i==Math.max(addpArr.length,addnArr.length)-1){            addpArr[i+1]=0;            addnArr[i+1]=0;        }        if(addpArr[i]+addnArr[i]>=10){            addpArr[i+1]+=1;			resultArr.push(addpArr[i]+addnArr[i]-10);        }else{			resultArr.push(addpArr[i]+addnArr[i]);		}    }//  我认为应该返回result才是对的，但是事实上返回resultArr才是对的    //     var result=new listNode("");// 	result.val=resultArr[0];// 	result.next=lastNode;// 	var lastNode;// 	for(var i = 1;i