fix AddTwoNumbers problems

AddTwoNumbers/program.js

@@ -0,0 +1,67 @@
+
+ /**
+ *Definition for singly-linked list.
+ */
+ var ListNode = function(val) {
+      this.val = val;
+      this.next = null;
+ }
+
+/**
+ * @param {ListNode} l1
+ * @param {ListNode} l2
+ * @return {ListNode}
+ */
+var addTwoNumbers = function(l1, l2) {
+
+	if (!l1 || !l2) { return null;}
+
+	var a = l1.val + l2.val;
+	var bu = parseInt(a / 10);
+	a = a % 10;
+	var resultNode = new ListNode(a);
+
+	var current = resultNode;
+
+
+	var node1 = l1.next;
+	var node2 = l2.next;
+
+	while(node1 ||  node2) {
+		a = (node1 && node1.val) + (node2 && node2.val) + bu;
+		// 获取数量之和 + 上一次的进位
+		bu = parseInt(a /10)
+
+		a = a % 10;
+
+		var nextNode = new ListNode(a)
+
+		current.next = nextNode;
+		current = nextNode;
+
+	    node1 = node1 && node1.next;
+	    node2 = node2 && node2.next;
+	}
+
+	if (bu) {current.next = new ListNode(bu);}
+
+    return resultNode;
+};
+
+function buildNodeList(arr) {
+  if (!arr || !arr.length) { return null;}
+  var result = new ListNode(arr[0]);
+  var i = 1, len = arr.length;
+  var next = null;
+  var current = result;
+  for(; i < len; i++) {
+    next = new ListNode(arr[i]);
+    current.next = next;
+    current = next;
+  }
+  return result;
+}
+
+console.log(buildNodeList([3,4,2,5]));
+console.log(buildNodeList([0]));
+console.log(addTwoNumbers(buildNodeList([1,8]), buildNodeList([0])));