数据结构140-二叉搜索树-后序遍历代码-摩杜云开发者社区

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    <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>封装二叉搜索树</title>
  </head>
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    <script>
      function BinarySearchTree() {
        function Node(key) {
          this.key = null;
          this.left = null;
          this.right - null;
        }
        this.root = null;

        BinarySearchTree.prototype.insert = function (key) {
          var newNode = new Node(key);
          //判断节点是否有值
          if (this.root == null) {
            this.root = newNode;
          } else {
            this.insertNode(this.root, newNode);
          }
        };
        BinarySearchTree.prototype.insertNode = function (node, newNode) {
          if (newNode.key < node.key) {
            if (node.left == null) {
              node.left = newNode;
            } else {
              this.insertNode(node.left, newNode);
            }
          } else {
            if (node.right == null) {
              node.right = newNode;
            } else {
              this.insertNode(node.right, newNode);
            }
          }
        };
        //先序遍历
        BinarySearchTree.prototype.preOrderTraversal = function (handler) {
          this.preOrderTraversalNode(this.root, handler);
        };

        BinarySearchTree.prototype.preOrderTraversalNode = function (
          node,
          handler
        ) {
          if (node != null) {
            //处理经过的节点
            handler(node.key);
            this.preOrderTraversalNode(node.left, handler);
            this.preOrderTraversalNode(node.right, handler);
          }
        };
        //中序遍历
        BinarySearchTree.prototype.middleOrderTraversal = function (handler) {
          this.middleOrderTraversalNode(this.root, handler);
        };
        BinarySearchTree.prototype.middleOrderTraversalNode = function (
          node,
          handler
        ) {
          if (node != null) {
            //处理经过的节点
            handler(node.key);
            this.preOrderTraversalNode(node.left, handler);
            handler(node.key)
            this.preOrderTraversalNode(node.right, handler);
          }
        };
        //中序遍历
        BinarySearchTree.prototype.postOrderTraversal = function (handler) {
          this.postOrderTraversalNode(this.root, handler);
        };
        BinarySearchTree.prototype.postOrderTraversalNode = function (
          node,
          handler
        ) {
          if (node != null) {
            //处理经过的节点
            handler(node.key);
            this.postOrderTraversalNode(node.left, handler);
            this.postOrderTraversalNode(node.right, handler);
            handler(node.key)
          }
        };
      }
    </script>
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