1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="UTF-8"> 5 <title>二叉查找树</title> 6 </head> 7 <body> 8 <script> 9 function Node(data,left,right){ 10 this.data = data; 11 this.left = left; 12 this.right = right; 13 this.show = show; 14 } 15 16 function show(){ 17 return this.data; 18 } 19 20 function BST(){ 21 this.root = null; 22 this.insert = insert; 23 this.inOrder = inOrder; 24 this.preOrder = preOrder; 25 this.postOrder = postOrder; 26 this.getMin = getMin; 27 this.getMax = getMax; 28 this.find = find; 29 this.remove = remove; 30 } 31 function insert(data){ 32 var n = new Node(data,null,null); 33 if(this.root == null ){ 34 this.root = n; 35 console.log(this.root,"insert"); 36 }else{ 37 var current = this.root; 38 var parent; 39 while(true){ 40 parent = current; 41 if(data < current.data){ 42 current = current.left; 43 44 if(current == null ){ 45 parent.left = n; 46 break; 47 } 48 }else{ 49 current = current.right; 50 if(current == null ){ 51 parent.right = n; 52 break; 53 } 54 } 55 } 56 } 57 } 58 //中序遍历 59 function inOrder(node){ 60 if(node !=null){ 61 inOrder(node.left); 62 console.log(node.show(),"zhongxu") 63 inOrder(node.right); 64 } 65 } 66 //先序遍历 67 function preOrder(node){ 68 if(node !=null){ 69 console.log(node.show()); 70 preOrder(node.left); 71 preOrder(node.right); 72 } 73 } 74 75 //后序遍历 76 function postOrder(node){ 77 if(node != null){ 78 postOrder(node.left); 79 postOrder(node.right); 80 console.log(node.show()); 81 } 82 } 83 // 查找最小值 84 function getMin(){ 85 var current = this.root; 86 while (current.left != null){ 87 current = current.left; 88 } 89 return current.data; 90 } 91 //查找最大值 92 function getMax(){ 93 var current = this.root; 94 while(current.right != null){ 95 current = current.right; 96 } 97 return current.data; 98 } 99 100 //查找给定值 101 function find(data){ 102 var current = this.root; 103 while(current != null){ 104 if(data == current.data){ 105 return current; 106 }else if(data>current.data){ 107 current = current.right; 108 }else{ 109 current = current.left; 110 } 111 } 112 return null; 113 } 114 115 116 //删除节点 117 118 function remove(data){ 119 root = removeNode(this.root,data); 120 } 121 function removeNode(node,data){ 122 if(node == null){ 123 return null; 124 } 125 if(data == node.data){ 126 //没有子节点的节点 127 if(node.left == null && node.right == null){ 128 return null; 129 } 130 //没有左子节点 131 if(node.left == null){ 132 return node.right; 133 } 134 //没有右子节点 135 if(node.right == null){ 136 return node.left; 137 } 138 //有两个子节点的节点 139 var temp = getSmall(node.right); 140 node.data = temp.data; 141 node.right = removeNode(node.right,temp.data); 142 return node; 143 }else if(data < node.data){ 144 node.left = removeNode(node.left,data); 145 return node; 146 }else{ 147 node.right = removeNode(node.right,data); 148 return node; 149 } 150 } 151 //获取最小值 152 function getSmall(node){ 153 console.log("123456") 154 if(node.left ==null && node.right == null ){ 155 return node; 156 } 157 while(node.left !=null ){ 158 node = node.left; 159 } 160 return node; 161 } 162 var obj = new BST(); 163 obj.insert(15); 164 obj.insert(22); 165 obj.insert(9); 166 obj.insert(30); 167 obj.inOrder(obj.root); 168 obj.preOrder(obj.root); 169 obj.postOrder(obj.root); 170 console.log(obj.getMin(),"最小值"); 171 console.log(obj.getMax(),"最大值"); 172 173 console.log(obj.find(22)); 174 175 176 obj.remove(15); 177 obj.inOrder(obj.root); 178 </script> 179 </body> 180 </html>