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function BinarySearchTree() {
var Node = function(key) {
this.key = key;
this.left = null;
this.right = null;
}
var root = null;
var insertNode = function(node, newNode) {
if (newNode.key<node.key) {
if (node.left == null) {
node.left = newNode;
} else {
insertNode(node.left, newNode);
}
} else {
if (node.right == null) {
node.right = newNode;
} else {
insertNode(node.right, newNode);
}
}
}
this.insert = function(key) {
var newNode = new Node(key);
if (root == null) {
root = newNode;
} else {
insertNode(root, newNode);
}
}
var inOrderTraverseNode = function(node, callBack) {
if (node != null) {
inOrderTraverseNode(node.left, callBack);
callBack(node.key);
inOrderTraverseNode(node.right, callBack);
}
}
var printNode = function(value) {
console.log(value);
}
this.inOrderTraverse = function(callBack) {
inOrderTraverseNode(root, callBack)
}
var preOrderTraverseNode = function(node, callBack) {
if (node != null) {
callBack(node.key);
preOrderTraverseNode(node.left, callBack);
preOrderTraverseNode(node.right, callBack);
}
}
this.preOrderTraverse = function(callBack) {
preOrderTraverseNode(root, callBack);
}
var postOrderTraverseNode = function(node, callBack) {
if (node != null) {
postOrderTraverseNode(node.left, callBack);
postOrderTraverseNode(node.right, callBack);
callBack(node.key);
}
}
this.postOrderTraverse = function(callBack) {
postOrderTraverseNode(root, callBack);
}
var minNode = function(node) {
if (node) {
while (node && node.left != null) {
node = node.left;
}
return node.key;
}
return null;
}
this.min = function() {
return minNode(root);
}
var maxNode = function(node) {
if (node) {
while (node && node.right != null) {
node = node.right;
}
return node.key;
}
return null;
}
this.max = function() {
return maxNode(root);
}
var searchNode = function(node, key) {
if (node == null) {
return false;
}
if (key < node.key) {
return searchNode(node.left, key)
} else if (key > node.key) {
return searchNode(node.right, key)
} else {
return true;
}
}
this.search = function(key) {
return searchNode(root, key);
}
var findMinNode = function(node) {
if (node) {
while (node && node.left != null) {
node = node.left;
}
return node;
}
return null;
}
this.findMin = function() {
return findMinNode(root);
}
var removeNode = function(node, key) {
if (node == null) {
return null;
}
if (key < node.key) {
node.left = removeNode(node.left, key);
return node;
} else if (key > node.key) {
node.right = removeNode(node.right, key);
return node;
} else {
if (node.left == null && node.right == null) {
node = null;
return node;
}
if (node.left == null) {
node = null;
return node;
}
if (node.right == null) {
node = node.left;
return node;
}
var aux = findMinNode(node.right);
node.key = aux.key;
node.right = removeNode(node.right, aux.key);
return node;
}
}
this.remove = function(key) {
root = removeNode(root, key);
}
}
var tree = new BinarySearchTree();
tree.insert(11);
tree.insert(7);
tree.insert(15);
tree.insert(3);
tree.insert(9);
tree.insert(8);
tree.insert(10);
tree.insert(13);
tree.insert(12);
tree.insert(14);
tree.insert(20);
tree.insert(18);
tree.insert(25);
tree.insert(6);
tree.inOrderTraverse(function(key) {
console.log(key);
})
tree.preOrderTraverse(function(key) {
console.log(key);
})
tree.postOrderTraverse(function(key) {
console.log(key);
})
tree.min(function(key) {
console.log(key);
})
tree.max(function(key) {
console.log(key);
})
tree.findMin();
console.log(tree.search(6));
tree.remove(6);
console.log(tree.search(10));
JavaScript Tre
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原文地址：http://www.cnblogs.com/shidengyun/p/5127147.html
