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ife_task_2.7.html
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ife_task_2.7.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>task 2.7</title>
<style type="text/css">
#big{height: 40px;}
input{margin-right: 10px;}
button{margin-right: 30px;}
#cont{width: 600px; height: 300px;}
#cont div{display: flex; flex-grow: 1; flex-wrap: wrap; align-items: stretch; margin: 10px; border: 1px solid black; box-sizing: content-box; min-height: 30px; background-color: white;}
</style>
</head>
<body>
<div id="big"></div>
<div id="cont"></div>
<script type="text/javascript">
var cont = document.getElementById('cont');
var container = document.getElementById('big');
var input = document.createElement('input');
container.appendChild(input);
var buttonSum = document.createElement('button');
buttonSum.innerHTML = '输入二叉树深度，创建二叉树';
container.appendChild(buttonSum);
var buttonFirst = document.createElement('button');
buttonFirst.innerHTML = '先序遍历';
container.appendChild(buttonFirst);
var buttonMiddle = document.createElement('button');
buttonMiddle.innerHTML = '中序遍历';
container.appendChild(buttonMiddle);
var buttonLast = document.createElement('button');
buttonLast.innerHTML = '后序遍历';
container.appendChild(buttonLast);
var tree = [];
//节点
function Node() {
this.leftChild = null;
this.rightChild = null;
this.express = document.createElement('div');
}
//创建二叉树
function createTree(num) {
var j = Math.pow(2, num) - 1;
var l = Math.pow(2, num-1) - 1;
for ( var i = 0; i < j; i ++){
var node = new Node();
tree.push(node);
}
var root = tree[0];
cont.appendChild(root.express);
var leftIndex, rightIndex;
for ( var k = 0; k < l; k++ ){
leftIndex = 2*k + 1;
rightIndex = 2*k + 2;
tree[k].leftChild = tree[leftIndex];
tree[k].rightChild = tree[rightIndex];
}
build(tree[1]);
build(tree[2]);
}
function build(node){
var parentIndex;
if (tree.indexOf(node) == 1 || tree.indexOf(node) == 2) {
parentIndex = 0;
}
else{
parentIndex = Math.round((tree.indexOf(node) - 2 )/2);
}
tree[parentIndex].express.appendChild(node.express);
if (node.leftChild) arguments.callee(node.leftChild);
if (node.rightChild) arguments.callee(node.rightChild);
}
buttonSum.onclick = function(){
cont.innerHTML = '';
var number = parseInt(input.value);
createTree(number);
};
var showTree = [];
//显示遍历的变化
function showtrees(tree){
if (tree instanceof Array){
for (var i = 0; i < tree.length; i ++){
setTimeout(function(i){ return function() {tree[i].style.backgroundColor = '#eeeeee';}}(i), 1000*(i+1));
setTimeout(function(i){ return function() {tree[i].style.backgroundColor = 'white';} }(i), 1000*(i+1)+500);
}
}
}
//先序遍历
function preOrder(node){
showTree.push(node.express);
// setTimeout(function(){
// node.express.style.backgroundColor = 'white';
// if (node.leftChild) preOrder(node.leftChild);
// if (node.rightChild) preOrder(node.rightChild);
// } ,1000); 遍历的时间顺序有问题
if (node.leftChild) preOrder(node.leftChild);
if (node.rightChild) preOrder(node.rightChild);
}
buttonFirst.onclick = function(){
showTree.length = 0;
preOrder(tree[0]);
showtrees(showTree);
};
//中序遍历
function inOrder(node){
if (node){
if (node.leftChild) arguments.callee(node.leftChild);
showTree.push(node.express);
if (node.rightChild) arguments.callee(node.rightChild);
}
}
buttonMiddle.onclick = function(){
showTree.length = 0;
inOrder(tree[0]);
showtrees(showTree);
};
//后序遍历
function postOrder(node){
if (node){
if (node.leftChild) arguments.callee(node.leftChild);
if (node.rightChild) arguments.callee(node.rightChild);
showTree.push(node.express);
}
}
buttonLast.onclick = function(){
showTree.length = 0;
postOrder(tree[0]);
showtrees(showTree);
};
</script>
</body>
</html>