<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>BST</title>
</head>
<body>
</body>
</html>
<script>
function Node(data,left,right){
this.data = data;
this.left = left;
this.right = right;
this.count = 1;
this.show=function(){
return this.data;
}
}
function BST(){
this.root = null;
}
BST.prototype={
//增加计数
insert:function(data){
var target = this.find(data);
if(target === null){
var n = new Node(data,null,null);
var temp,parent;
if(this.root === null){
this.root = n;
}else{
temp = this.root;
while(temp !== null){
parent = temp;
if(n.data < temp.data){
temp = temp.left;
if(temp === null){
parent.left = n;
break;
}
}else{
temp = temp.right;
if(temp === null){
parent.right = n;
break;
}
}
}
}
}else{
target.count++;
}
},
/*三种遍历方法*/
//第一种，中序，最常见方法；
midShow:function(node=this.root){
var str = "";
if(node !== null){
str += this.midShow(node.left)
str += node.show()+"-->"+node.count+",";
str += this.midShow(node.right);
}
return str;
},
//第二种：先序
preShow:function(node=this.root){
var str = "";
if(node !== null){
str += node.show()+"-->"+node.count+",";
str += this.preShow(node.left);
str += this.preShow(node.right);
}
return str;
},
//第三种：后序
laterShow:function(node=this.root){
var str = "";
if(node !== null){
str += this.preShow(node.left);
str += this.preShow(node.right);
str += node.show()+"-->"+node.count+",";
}
return str;
},
/*查找最小节点和最大节点*/
max:function(){
var temp = this.root;
while(temp !== null){
if(temp.right !== null){
temp = temp.right;
}else{
return temp;
}
}
},
min:function(){
var temp = this.root;
while(temp !== null){
if(temp.left !== null){
temp = temp.left;
}else{
return temp;
}
}
},
/*删除节点*/
//找到节点
find:function(data){
var temp = this.root;
while(temp !== null){
if(temp.data === data){
return temp;
}else if(data < temp.data){
temp = temp.left;
}else{
temp = temp.right;
}
}
return null;
},
//找到具体节点下最小节点
getThemin:function(node=this.root){
var temp = node;
while(temp !== null){
if(temp.left !== null){
temp = temp.left;
}else{
return temp;
}
}
},
// 移除节点，三种情况，第一种，没有子节点；第二种：只有一个子节点；第三种：有两个子节点；
remove:function(data){
this.root = this.removeNode(this.root,data);
},
removeNode:function(node=this.root,data){
var current = node;
if(current === null){
return null;
}
if(data === current.data){
if(current.left === null && current.right === null){
return null;
}else if(current.left === null){
return current.right;
}else if(current.right === null){
return current.left;
}else{
var temp = this.getThemin(current.right);
current.data = temp.data;
current.right = this.removeNode(current.right,temp.data);
return current;
}
}else if(data < current.data){
current.left = this.removeNode(current.left,data);
return current;
}else{
current.right = this.removeNode(current.right,data);
return current;
}
},
//返回节点个数
getCount:function(node=this.root){
var temp = node;
var count = 0;
if(temp !== null){
count++;
count+= this.getCount(temp.left);
count+= this.getCount(temp.right);
}
return count;
},
//返回边的个数
getSides:function(node=this.root){
var count = this.getCount(node);
return count > 0 ? count-1 : null;
}
}
var bst = new BST();
bst.insert(10);
bst.insert(13);
bst.insert(23);
bst.insert(1);
bst.insert(42);
bst.insert(11);
bst.insert(23);
bst.insert(1);
bst.insert(42);
bst.insert(11);
bst.insert(123);
bst.insert(213);
bst.insert(322);
bst.insert(121);
console.log(bst.midShow());
console.log(bst.preShow());
console.log(bst.laterShow());
console.log(bst.max())
console.log(bst.min())
console.log(bst.find(121));
bst.remove(213)
console.log(bst)
console.log(bst.midShow());
console.log(bst.getCount())
console.log(bst.getSides())
</script>
<script>
function Node(data,left,right){
this.content = data;
this.data = getData(data);
this.left = left;
this.right = right;
this.count = 1;
this.show=function(){
return this.content;
}
function getData(data){
var num = 0;
for(var i = 0,len=data.length;i<len;i++){
num += data.charCodeAt(i)*len;
}
return num;
}
}
function BST(){
this.root = null;
}
BST.prototype={
//增加计数
insert:function(data){
var target = this.find(data);
if(target === null){
var n = new Node(data,null,null);
var temp,parent;
if(this.root === null){
this.root = n;
}else{
temp = this.root;
while(temp !== null){
parent = temp;
if(n.data < temp.data){
temp = temp.left;
if(temp === null){
parent.left = n;
break;
}
}else{
temp = temp.right;
if(temp === null){
parent.right = n;
break;
}
}
}
}
}else{
target.count++;
}
},
/*三种遍历方法*/
//第一种，中序，最常见方法；
midShow:function(node=this.root){
var str = "";
if(node !== null){
str += this.midShow(node.left)
str += node.show()+":"+node.count+"\n";
str += this.midShow(node.right);
}
return str;
},
/*查找最小节点和最大节点*/
max:function(){
var temp = this.root;
while(temp !== null){
if(temp.right !== null){
temp = temp.right;
}else{
return temp;
}
}
},
min:function(){
var temp = this.root;
while(temp !== null){
if(temp.left !== null){
temp = temp.left;
}else{
return temp;
}
}
},
/*删除节点*/
//找到节点
find:function(data){
var dat = getData(data);
var temp = this.root;
while(temp !== null){
if(temp.data === dat){
return temp;
}else if(dat < temp.data){
temp = temp.left;
}else{
temp = temp.right;
}
}
return null;
function getData(data){
var num = 0;
for(var i = 0,len=data.length;i<len;i++){
num += data.charCodeAt(i)*len;
}
return num;
}
},
//返回节点个数
getCount:function(node=this.root){
var temp = node;
var count = 0;
if(temp !== null){
count++;
count+= this.getCount(temp.left);
count+= this.getCount(temp.right);
}
return count;
},
//返回边的个数
getSides:function(node=this.root){
var count = this.getCount(node);
return count > 0 ? count-1 : null;
},
//转换成单词计数格式
getWords:function(str){
var arr = str.replace(/[;?!]/g," ").split(",").join(" ").split(" ");
var data;
for(var i = 0,len = arr.length;i<len;i++){
arr[i] && this.insert(arr[i].toLowerCase());
}
}
}
var hst = new BST();
var txt = "Life is full of confusing and disordering Particular time,a particular location,Do the arranged thing of ten million time in the brain,Step by step,the life is hard to avoid delicacy and stiffness No enthusiasm forever,No unexpected happening of surprising and pleasing So,only silently ask myself in mind Next happiness,when will come?";
hst.getWords(txt);
console.log(hst.midShow())
console.log(hst.getCount())
console.log(hst.find("is"))
</script>
