编辑代码

class ListNode {
    constructor(val) {
        this.value = val;
        this.next = null;
    }
}
function addTwoNumbers(l1, l2) {
    const sum = new ListNode(0);
    let curr = sum;
    let carry = 0;
    while(l1 || l2 || carry) {
        const val1 = l1 ? l1.value : 0;
        const val2 = l2 ? l2.value : 0;
        const total = val1 + val2 + carry;
        carry = Math.floor(total / 10);
        curr.next = new ListNode(total % 10);
        curr = curr.next;
        l1 = l1 ? l1.next : null;
        l2 = l2 ? l2.next : null
    }
    return sum.next
}
const l1 = new ListNode(2)
l1.next = new ListNode(4)
l1.next.next = new ListNode(3)
const l2 = new ListNode(5)
l2.next = new ListNode(6)
l2.next.next = new ListNode(4)
let result = addTwoNumbers(l1,l2)
while(result) {
    console.log(result.value)
    result = result.next
}