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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="./myRedBlackTree.js"></script>
<script src="https://unpkg.com/lodash"></script>
<style>
div.tree {
display: flex;
flex-wrap: wrap;/*span需要独占一行，所以此flex布局必须要折行显示*/
align-items: flex-start;
}
.red {
color: red;
}
.black {
color: black;
}
.tree > .tree {
width: 50%;
}
div.tree > span {
width: 100%;
text-align: center;
padding-bottom: 3em;
background-image: url(both.svg);
background-repeat: no-repeat;
background-size: 100% calc(100% - 0);
background-position: 0 0;
}
/*没有后代的子树不再展示连线和多余空间*/
div.tree > span:only-child {
background-image: none;
padding-bottom: 0;
}
/*右/右子树自动往左/右偏*/
div.left {
margin-right: auto;
}
div.right {
margin-left: auto;
}
/*只有单边子树的元素，让此单边子树占用90%的空间*/
div.only-has-left > div.tree {
width: 90%;
margin-right: auto;
}
div.only-has-right > div.tree {
width: 90%;
margin-left: auto;
}
/*只有单边子树的元素只显示单边的连线*/
div.only-has-left > span {
background-image: url(left.svg);
}
div.only-has-right > span {
background-image: url(right.svg);
}
</style>
</head>
<body>
<div>
<input type="text" class="insertInput">
<button class="insertBtn">插入</button>
<input type="text" class="deleteInput">
<button class="deleteBtn">删除</button>
<input type="text" class="insertStart">
<span>To</span>
<input type="text" class="insertEnd">
<button class="startToEnd">连续插入</button>
<button class="deleteAll">清空</button>
<button onclick="startRandom()">开始随机</button>
<button onclick="stopRandom()">结束随机</button>
</div>
<div class="container" style="position: relative;">
</div>
<script type="text/javascript">
let tree = new myRedBlackTree();
let container = document.querySelector(".container");
function insert(value) {
tree.insert(value);
render();
}
function deleteNode(value) {
tree.delete(value);
render();
}
function render() {
container.innerHTML = travelTree(tree.root);
}
function travelTree(root) {
if (root) {
let onlyLeft = (root.left && !root.right)
let onlyRight = (!root.left && root.right)
let both = root.left && root.right
let noSubTree = !root.left && !root.right
return `
<div class="
tree
${both?'both':''}
${noSubTree?'no-sub-tree':''}
${onlyLeft?'only-has-left':''}
${onlyRight?'only-has-right':''}
${root.color? 'red':'black'}
">
<span>${root.value}</span>
${travelTree(root.left)}
${travelTree(root.right)}
</div>
`
} else {return''}
}
render();
var insertInput = document.querySelector(".insertInput");
var deleteInput = document.querySelector(".deleteInput");
var insertBtn = document.querySelector(".insertBtn");
var deleteBtn = document.querySelector(".deleteBtn");
var startToEnd = document.querySelector(".startToEnd");
var start = document.querySelector(".insertStart")
var end = document.querySelector(".insertEnd");
var delAll = document.querySelector(".deleteAll");
insertBtn.addEventListener("click", (e) => {
var value = insertInput.value;
if (value == "") return;
insert(value);
insertInput.value = "";
insertInput.focus();
})
deleteBtn.addEventListener("click", (e) => {
var value = deleteInput.value;
deleteNode(value);
deleteInput.value = "";
deleteInput.focus();
})
startToEnd.addEventListener("click",(e) => {
if (s == "" || e == "") {
return;
}
var s = +start.value;
var e = +end.value;
if (e - s < 0) {
return ;
}
for (let i = s; i <= e;i++) {
tree.insert(i);
}
render();
start.value = "";
end.value = "";
start.focus();
})
delAll.addEventListener("click", (e) => {
tree.root = null;
render();
})
start.value = 1;
end.value = 30;
startToEnd.click();
function random() {
tree.insert(_.random(0,1000));
render();
};
let interval;
function startRandom() {
interval = setInterval(random, 800);
}
function stopRandom() {
clearInterval(interval);
}
</script>
</body>
</html>