数据结构62-双向链表get方法实现代码 

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>双向链表</title>
  </head>
  <body>
    <script>
      function DoubleList() {
        this.head = null;
        this.tail = null;
        this.length = 0;
 
        function Node(data) {
          this.data = data;
          this.prev = null;
          this.next = null;
        }
 
        DoubleList.prototype.append = function (data) {
          var newNode = new Node(data);
          if (this.length == 0) {
            this.head = newNode;
          } else {
            var current = this.head;
            while (current.next) {
              current = current.next;
            }
            current.next = newNode;
          }
          this.length += 1;
        };
 
        DoubleList.prototype.backwardString = function (data) {
          //定义变量
          var current = this.head;
          var resultString = "";
          while (current) {
            resultString += current.data + " ";
            current = current.next;
          }
          return resultString;
        };
 
        DoubleList.prototype.forwardString = function (data) {
          //定义变量
          var current = this.tail;
          var resultString = "";
          while (current) {
            resultString += current.data + " ";
            current = current.prev;
          }
          return resultString;
        };
 
        DoubleList.prototype.toString = function (data) {
          //定义变量
          return this.backwardString();
        };
 
        DoubleList.prototype.insert = function (position, data) {
          if (position < 0 || position > this.length) return false;
          var newNode = new Node(data);
          if (this.length == 0) {
            this.head = newNode;
            this.tail = newNode;
          } else {
            if (position == 0) {
              this.head.prev = newNode;
              newNode.next = this.head;
              this.head = newNode;
            } else if(position==this.length) {
                newNode.prev=this.tail
                this.tail.next=newNode
                this.tail=newNode
            }else{
                var current=this.head
                var index=0
                while(index++<position){
                    current=current.next
 
                }
                newNode.next=current
                newNode.prev=current.prev
                current.prev.next=newNode
                current.prev=newNode
            }
          }
          this.length+=1
          return true
        };
        DoubleList.prototype.get = function (position, data) {
            if (position < 0 || position > this.length) return null;
            //获取元素
            var current=this.head
            var index=0
            while(index++<position){
                current=current.next
            }
            return current.data
 
        }
      }
    </script>
  </body>
</html>

posted @   前端导师歌谣  阅读(14)  评论(0)  编辑  收藏  举报
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