思想：
利用unshift往前面添加元素

function LinkList() {
    var Node = function(element) {
        this.element = element;
        this.next = null;
    };
    this.head = null;
    this.length = 0;
    if(typeof this.append != 'function') {
        LinkList.prototype.append = function(element) {
            var node = new Node(element);
            if(this.head === null) {
                this.head = node;
            } else {
                var currentNode = this.head;
                while(currentNode.next) {
                    currentNode = currentNode.next;
                }
                currentNode.next = node;
            }
            this.length++;
        };
        LinkList.prototype.getHead = function(){
            return this.head;
        };
    }
}
var linklist = new LinkList();
var arr = [1,2,3,4,5];
for(var i = 0; i < arr.length; i++) {
    linklist.append(arr[i]);
}

var reversePrint = function(linklist) {
    var head = linklist.getHead();
    var result = [];
    while(head) {
        result.unshift(head.element);
        head = head.next;
    }
    return result.join("->")
};

console.log(reversePrint(linklist));