文接上篇，地址：https://www.jianshu.com/p/68de9b3daa13
//单链表的逆序实现
func reverseList(_ headNode: inout Node){
var pre:Node?
var next:Node?
var tempList:Node? = headNode
while tempList != nil {
next = tempList?.next
tempList?.next = pre
pre = tempList
tempList = next
}
headNode = pre!
}
方法调用执行
let list1 = ListNode()
var node = list1.initListNodeFromTail2([3,5,12,20])
list1.printList(&node)
list1.reverseList(&node)
list1.printList(&node)
最后打印结果：20、12、5、3
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