怎么JavaScript中实现一个双向链表
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原理如下图所示:
示例代码:
/*双向链表 * */ function Node(element) { this.element = element; this.next = null; this.previous = null;//双向链表在这里需要增加一个previous属性 } function LList() { this.head = new Node("head"); this.find = find; this.insert = insert; this.display = display; this.remove = remove; this.findLast = findLast; this.dispReverse = dispReverse;//将链表反转 } function dispReverse() { var currNode = this.head; currNode = this.findLast(); var nodestr = ""; while (!(currNode.previous == null)) { nodestr += " "+currNode.element; currNode = currNode.previous; } console.log("将链表反转后: "+nodestr); } function findLast() { var currNode = this.head; while (!(currNode.next == null)) { currNode = currNode.next; } return currNode; } function remove(item) { var currNode = this.find(item); if (!(currNode.next == null)) { currNode.previous.next = currNode.next; currNode.next.previous = currNode.previous; currNode.next = null; currNode.previous = null; } } // findPrevious is no longer needed /*function findPrevious(item) { var currNode = this.head; while (!(currNode.next == null) && (currNode.next.element != item)) { currNode = currNode.next; } return currNode; }*/ function display() { var currNode = this.head; var nodestr = ""; while (!(currNode.next == null)) { nodestr += " "+currNode.next.element; currNode = currNode.next; } console.log(nodestr); } function find(item) { var currNode = this.head; while (currNode.element != item) { currNode = currNode.next; } return currNode; } function insert(newElement, item) { var newNode = new Node(newElement); var current = this.find(item); newNode.next = current.next; newNode.previous = current;//双向链表在这里需要设置新节点previous属性 current.next = newNode; } var cities = new LList(); cities.insert("Conway", "head"); cities.insert("Russellville", "Conway"); cities.insert("Carlisle", "Russellville"); cities.insert("Alma", "Carlisle"); cities.display();//Conway Russellville Carlisle Alma cities.remove("Carlisle"); cities.display();//Conway Russellville Alma cities.dispReverse();// Alma Russellville Conway
这里使用在线HTML/CSS/JavaScript代码运行工具:http://tools.jb51.net/code/HtmlJsRun测试上述代码,可得如下运行结果:
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