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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>HashMap 扩容动画演示</title>
<script src="https://cdn.tailwindcss.com"></script>
<link href="https://cdn.jsdelivr.net/npm/font-awesome@4.7.0/css/font-awesome.min.css" rel="stylesheet">
<link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap" rel="stylesheet">
<!-- Tailwind 配置 -->
<script>
tailwind.config = {
theme: {
extend: {
colors: {
primary: '#165DFF',
secondary: '#FF7D00',
success: '#00B42A',
warning: '#FF7D00',
danger: '#F53F3F',
dark: '#1D2129',
light: '#F2F3F5',
'hash-blue': '#4080FF',
'bucket-bg': '#F0F7FF',
'node-bg': '#E6F7FF',
'threshold': '#FAAD14'
},
fontFamily: {
inter: ['Inter', 'sans-serif'],
},
},
}
}
</script>
<style type="text/tailwindcss">
@layer utilities {
.content-auto {
content-visibility: auto;
}
.bucket {
@apply w-20 h-auto min-h-[80px] border-2 rounded-md flex flex-col items-center p-1 transition-all duration-300 relative;
}
.bucket-normal {
@apply border-gray-300 bg-bucket-bg;
}
.bucket-active {
@apply border-primary bg-primary/10;
}
.bucket-highlight {
@apply border-secondary ring-2 ring-secondary/30;
}
.node {
@apply w-full h-8 rounded my-0.5 flex items-center justify-center text-sm border font-medium transition-all duration-300;
}
.node-normal {
@apply border-gray-300 bg-white;
}
.node-moving {
@apply absolute z-10 shadow-lg scale-110 transition-all duration-500;
}
.node-new {
@apply border-primary bg-primary/10 animate-pulse;
}
.tree-node {
@apply w-10 h-10 rounded-full flex items-center justify-center text-sm border font-medium;
}
.arrow {
@apply absolute w-4 h-4 text-gray-400;
}
.progress-bar-fill {
@apply h-full transition-all duration-500 ease-out;
}
.resize-indicator {
@apply absolute -top-8 left-1/2 transform -translate-x-1/2 bg-primary text-white text-xs py-1 px-2 rounded whitespace-nowrap;
}
.tooltip {
@apply invisible absolute bg-dark text-white text-xs rounded py-1 px-2 z-50 transition-opacity duration-200 opacity-0 w-max;
}
.has-tooltip:hover .tooltip {
@apply visible opacity-100;
}
}
</style>
</head>
<body class="font-inter bg-gray-50 text-dark min-h-screen">
<!-- 顶部导航 -->
<header class="bg-white shadow-md sticky top-0 z-40">
<div class="container mx-auto px-4 py-4">
<div class="flex items-center space-x-2">
<i class="fa fa-expand text-primary text-2xl"></i>
<h1 class="text-xl md:text-2xl font-bold text-primary">HashMap 扩容动画演示</h1>
</div>
</div>
</header>
<!-- 主内容区 -->
<main class="container mx-auto px-4 py-8 max-w-6xl">
<!-- 介绍部分 -->
<section class="mb-8 text-center">
<h2 class="text-xl md:text-2xl font-bold mb-4">HashMap 动态扩容过程可视化</h2>
<p class="text-gray-600 mb-6">直观展示 HashMap 扩容的完整过程：从触发条件到容量翻倍，再到元素重新分配</p>
<div class="bg-white rounded-xl shadow-lg p-6 mb-8">
<div class="grid grid-cols-1 md:grid-cols-3 gap-6">
<div class="flex flex-col">
<label class="text-sm text-gray-500 mb-2">初始容量 (2ⁿ)</label>
<div class="flex items-center">
<select id="initialCapacity" class="flex-1 border border-gray-300 rounded-lg px-3 py-2 focus:outline-none focus:ring-2 focus:ring-primary/50">
<option value="4">4 (2²)</option>
<option value="8" selected>8 (2³)</option>
<option value="16">16 (2⁴)</option>
<option value="32">32 (2⁵)</option>
</select>
</div>
</div>
<div class="flex flex-col">
<label class="text-sm text-gray-500 mb-2">负载因子</label>
<div class="flex items-center">
<select id="loadFactor" class="flex-1 border border-gray-300 rounded-lg px-3 py-2 focus:outline-none focus:ring-2 focus:ring-primary/50">
<option value="0.5">0.5</option>
<option value="0.75" selected>0.75</option>
<option value="0.9">0.9</option>
<option value="1.0">1.0</option>
</select>
</div>
</div>
<div class="flex flex-col">
<label class="text-sm text-gray-500 mb-2">每次添加元素数量</label>
<div class="flex items-center">
<select id="addCount" class="flex-1 border border-gray-300 rounded-lg px-3 py-2 focus:outline-none focus:ring-2 focus:ring-primary/50">
<option value="1" selected>1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select>
</div>
</div>
</div>
</div>
<div class="flex flex-wrap gap-4 justify-center mb-6">
<button id="addElements" class="bg-primary hover:bg-primary/90 text-white px-6 py-3 rounded-lg shadow-md transition-all flex items-center">
<i class="fa fa-plus mr-2"></i> 添加元素
</button>
<button id="autoDemo" class="bg-secondary hover:bg-secondary/90 text-white px-6 py-3 rounded-lg shadow-md transition-all flex items-center">
<i class="fa fa-play mr-2"></i> 自动演示
</button>
<button id="resetDemo" class="bg-gray-200 hover:bg-gray-300 text-dark px-6 py-3 rounded-lg shadow-md transition-all flex items-center">
<i class="fa fa-refresh mr-2"></i> 重置
</button>
</div>
<!-- 状态指示器 -->
<div class="bg-white rounded-xl shadow p-4 mb-8">
<div class="grid grid-cols-1 md:grid-cols-4 gap-4">
<div class="flex items-center">
<div class="w-24 text-sm text-gray-500">当前容量:</div>
<div class="font-semibold text-primary" id="currentCapacity">8</div>
</div>
<div class="flex items-center">
<div class="w-24 text-sm text-gray-500">元素数量:</div>
<div class="font-semibold" id="elementCount">0</div>
</div>
<div class="flex items-center">
<div class="w-24 text-sm text-gray-500">阈值:</div>
<div class="font-semibold text-warning" id="thresholdValue">6</div>
</div>
<div class="flex items-center">
<div class="w-24 text-sm text-gray-500">负载因子:</div>
<div class="font-semibold" id="currentLoadFactor">0.75</div>
</div>
</div>
<!-- 填充进度条 -->
<div class="mt-4 h-3 bg-gray-200 rounded-full overflow-hidden relative">
<div id="fillProgress" class="progress-bar-fill bg-primary" style="width: 0%"></div>
<div id="thresholdMarker" class="absolute h-3 w-1 bg-threshold -translate-y-0.5" style="left: 75%"></div>
</div>
<div class="flex justify-between text-xs text-gray-500 mt-1">
<span>0</span>
<span id="thresholdLabel" class="text-threshold">阈值 (6)</span>
<span id="capacityLabel">容量 (8)</span>
</div>
</div>
</section>
<!-- 动画演示区 -->
<section class="bg-white rounded-xl shadow-lg p-6 mb-10 relative">
<h3 class="text-lg font-semibold mb-6 flex items-center">
<i class="fa fa-cubes text-primary mr-2"></i>
HashMap 结构可视化
<span id="resizeStatus" class="ml-4 text-sm bg-primary/10 text-primary px-3 py-1 rounded-full hidden">
<i class="fa fa-refresh fa-spin mr-1"></i> 正在扩容...
</span>
</h3>
<!-- 旧数组容器 -->
<div class="mb-10" id="oldHashMapContainer">
<h4 class="text-base font-medium mb-3 text-gray-700">当前 HashMap (容量: <span id="oldCapacityDisplay">8</span>)</h4>
<div id="oldBucketsContainer" class="flex flex-wrap gap-2 justify-center min-h-[120px]">
<!-- 桶将通过JS动态生成 -->
</div>
</div>
<!-- 扩容箭头指示器 -->
<div id="resizeArrow" class="hidden flex justify-center my-6">
<div class="text-gray-400 animate-bounce">
<i class="fa fa-long-arrow-down text-2xl"></i>
<div class="mt-1 text-sm">扩容中...</div>
</div>
</div>
<!-- 新数组容器 -->
<div id="newHashMapContainer" class="hidden">
<h4 class="text-base font-medium mb-3 text-gray-700">扩容后 HashMap (容量: <span id="newCapacityDisplay">16</span>)</h4>
<div id="newBucketsContainer" class="flex flex-wrap gap-2 justify-center min-h-[120px]">
<!-- 新桶将通过JS动态生成 -->
</div>
</div>
<!-- 过程说明 -->
<div class="mt-8 p-4 bg-light rounded-lg">
<h4 class="text-base font-medium mb-2 flex items-center">
<i class="fa fa-info-circle text-primary mr-2"></i>
过程说明
</h4>
<p id="processDescription" class="text-gray-600 text-sm">
HashMap 初始状态：容量为 8，阈值为 6 (8 × 0.75)。当元素数量超过阈值时，将触发扩容。
</p>
</div>
</section>
<!-- 扩容原理说明 -->
<section class="grid md:grid-cols-2 gap-6 mb-10 mx-auto">
<style>
.principle-card {
flex: 1;
min-width: 0;
}
</style>
<div class="bg-white rounded-xl shadow-lg p-6 principle-card">
<h3 class="text-lg font-semibold mb-3 flex items-center">
<i class="fa fa-lightbulb-o text-primary mr-2"></i> 扩容核心原理
</h3>
<ul class="space-y-3 text-gray-600 text-sm">
<li class="flex items-start">
<i class="fa fa-check-circle text-success mt-1 mr-2"></i>
<span><strong>触发条件</strong>：当元素数量超过阈值（容量 × 负载因子）时触发扩容</span>
</li>
<li class="flex items-start">
<i class="fa fa-check-circle text-success mt-1 mr-2"></i>
<span><strong>容量变化</strong>：新容量 = 旧容量 × 2，始终保持为 2 的幂</span>
</li>
<li class="flex items-start">
<i class="fa fa-check-circle text-success mt-1 mr-2"></i>
<span><strong>元素重分配</strong>：利用哈希值高位信息，无需重新计算哈希码</span>
</li>
<li class="flex items-start">
<i class="fa fa-check-circle text-success mt-1 mr-2"></i>
<span><strong>新索引计算</strong>：要么与旧索引相同，要么 = 旧索引 + 旧容量</span>
</li>
</ul>
</div>
<div class="bg-white rounded-xl shadow-lg p-6 principle-card">
<h3 class="text-lg font-semibold mb-3 flex items-center">
<i class="fa fa-code text-primary mr-2"></i> 索引计算优化
</h3>
<div class="bg-light p-4 rounded-lg font-mono text-sm overflow-x-auto">
<pre>// 旧容量为8 (2³)，旧掩码 = 8-1 = 7 (00000111)
旧索引 = hash & 7
// 新容量为16 (2⁴)，新掩码 = 16-1 = 15 (00001111)
新索引 = hash & 15
// 新索引只有两种可能：
if ((hash & 8) == 0) {
新索引 = 旧索引
} else {
新索引 = 旧索引 + 8 // 旧容量
}</pre>
<div class="mt-3 text-gray-600 font-normal">
这种优化避免了重新计算哈希码，只需检查哈希值的第4位（8的二进制是1000）即可确定新索引
</div>
</div>
</div>
</section>
</main>
<!-- 页脚 -->
<footer class="bg-dark text-white py-6">
<div class="container mx-auto px-4 text-center text-gray-400 text-sm">
© HashMap 扩容动画演示 | 展示从触发条件到元素重分配的完整过程
</div>
</footer>
<script>
// 全局变量
let capacity = 8; // 当前容量
let loadFactor = 0.75; // 负载因子
let threshold = capacity * loadFactor; // 阈值
let size = 0; // 元素数量
let elements = []; // 存储所有元素的数组
let isAnimating = false; // 动画状态
let isAutoPlaying = false; // 自动演示状态
let autoPlayInterval = null; // 自动演示计时器
let animationSpeed = 800; // 动画速度（毫秒）
// DOM 元素
const initialCapacitySelect = document.getElementById('initialCapacity');
const loadFactorSelect = document.getElementById('loadFactor');
const addCountSelect = document.getElementById('addCount');
const addElementsBtn = document.getElementById('addElements');
const autoDemoBtn = document.getElementById('autoDemo');
const resetDemoBtn = document.getElementById('resetDemo');
const currentCapacityEl = document.getElementById('currentCapacity');
const elementCountEl = document.getElementById('elementCount');
const thresholdValueEl = document.getElementById('thresholdValue');
const currentLoadFactorEl = document.getElementById('currentLoadFactor');
const fillProgressEl = document.getElementById('fillProgress');
const thresholdMarkerEl = document.getElementById('thresholdMarker');
const thresholdLabelEl = document.getElementById('thresholdLabel');
const capacityLabelEl = document.getElementById('capacityLabel');
const oldCapacityDisplayEl = document.getElementById('oldCapacityDisplay');
const newCapacityDisplayEl = document.getElementById('newCapacityDisplay');
const oldBucketsContainerEl = document.getElementById('oldBucketsContainer');
const newBucketsContainerEl = document.getElementById('newBucketsContainer');
const oldHashMapContainerEl = document.getElementById('oldHashMapContainer');
const newHashMapContainerEl = document.getElementById('newHashMapContainer');
const resizeArrowEl = document.getElementById('resizeArrow');
const resizeStatusEl = document.getElementById('resizeStatus');
const processDescriptionEl = document.getElementById('processDescription');
// 初始化
document.addEventListener('DOMContentLoaded', () => {
updateStatusDisplay();
initializeBuckets();
setupEventListeners();
});
// 设置事件监听器
function setupEventListeners() {
// 添加元素按钮
addElementsBtn.addEventListener('click', () => {
if (!isAnimating) {
const count = parseInt(addCountSelect.value);
addElements(count);
}
});
// 自动演示按钮
autoDemoBtn.addEventListener('click', toggleAutoDemo);
// 重置按钮
resetDemoBtn.addEventListener('click', resetDemo);
// 初始容量变化
initialCapacitySelect.addEventListener('change', () => {
if (!isAnimating && !isAutoPlaying) {
resetDemo();
}
});
// 负载因子变化
loadFactorSelect.addEventListener('change', () => {
if (!isAnimating && !isAutoPlaying) {
loadFactor = parseFloat(loadFactorSelect.value);
// 立即更新阈值
threshold = capacity * loadFactor;
updateStatusDisplay();
updateProcessDescription(`负载因子已更新为 ${loadFactor}，新阈值 = ${capacity} × ${loadFactor} = ${threshold.toFixed(1)}`);
}
});
}
// 初始化桶
function initializeBuckets() {
oldBucketsContainerEl.innerHTML = '';
for (let i = 0; i < capacity; i++) {
const bucket = createBucket(i);
oldBucketsContainerEl.appendChild(bucket);
}
}
// 创建桶元素
function createBucket(index) {
const bucket = document.createElement('div');
bucket.className = 'bucket bucket-normal has-tooltip';
bucket.dataset.index = index;
// 索引标签
const indexLabel = document.createElement('div');
indexLabel.className = 'text-xs text-gray-500 mb-1';
indexLabel.textContent = `#${index}`;
// 节点容器
const nodesContainer = document.createElement('div');
nodesContainer.className = 'w-full flex flex-col items-center';
nodesContainer.dataset.index = index;
// 提示框
const tooltip = document.createElement('div');
tooltip.className = 'tooltip';
tooltip.textContent = `桶 #${index}`;
bucket.appendChild(indexLabel);
bucket.appendChild(nodesContainer);
bucket.appendChild(tooltip);
return bucket;
}
// 添加元素
function addElements(count) {
if (isAnimating) return;
isAnimating = true;
addElementsBtn.disabled = true;
let added = 0;
// 逐个添加元素，带点延迟
const addNextElement = () => {
if (added < count) {
// 生成随机键值对
const key = generateRandomKey();
const value = Math.floor(Math.random() * 1000);
const element = { key, value };
// 计算哈希码和索引
const hashCode = calculateHashCode(key);
const index = calculateIndex(hashCode, capacity);
// 存储元素信息
element.hashCode = hashCode;
element.index = index;
elements.push(element);
// 添加到UI
addElementToBucketUI(element, index);
size++;
updateStatusDisplay();
added++;
setTimeout(addNextElement, animationSpeed / 2);
} else {
// 修复扩容判断逻辑，使用精确比较
if (size > threshold || Math.abs(size - threshold) < 0.001) {
updateProcessDescription(`元素数量 (${size}) 超过阈值 (${threshold.toFixed(1)})，触发扩容...`);
// 先重置isAnimating，确保performResize可以执行
isAnimating = false;
setTimeout(performResize, animationSpeed);
} else {
isAnimating = false;
addElementsBtn.disabled = false;
// 如果是自动演示，继续
if (isAutoPlaying) {
scheduleNextAutoStep();
}
}
}
};
addNextElement();
}
// 将元素添加到桶的UI
function addElementToBucketUI(element, index) {
return new Promise(resolve => {
// 创建节点元素
const node = document.createElement('div');
node.className = 'node node-new';
node.textContent = `${element.key}=${element.value}`;
node.dataset.key = element.key;
// 获取对应的桶
const bucket = oldBucketsContainerEl.querySelector(`.bucket[data-index="${index}"] .flex-col`);
// 添加到桶中
bucket.appendChild(node);
// 高亮显示该桶
const bucketEl = oldBucketsContainerEl.querySelector(`.bucket[data-index="${index}"]`);
bucketEl.classList.remove('bucket-normal');
bucketEl.classList.add('bucket-active');
// 更新说明
updateProcessDescription(`添加元素 ${element.key}=${element.value}，哈希码: ${element.hashCode}，索引: ${index}`);
// 一段时间后移除高亮和新元素标记
setTimeout(() => {
node.classList.remove('node-new');
node.classList.add('node-normal');
bucketEl.classList.remove('bucket-active');
bucketEl.classList.add('bucket-normal');
resolve();
}, animationSpeed / 2);
});
}
// 执行扩容
function performResize() {
if (isAnimating) return;
isAnimating = true;
resizeStatusEl.classList.remove('hidden');
updateProcessDescription('开始扩容：容量翻倍并重新分配元素...');
const oldCapacity = capacity;
const newCapacity = oldCapacity * 2;
// 更新显示
oldCapacityDisplayEl.textContent = oldCapacity;
newCapacityDisplayEl.textContent = newCapacity;
// 显示新数组容器和箭头
setTimeout(() => {
resizeArrowEl.classList.remove('hidden');
newHashMapContainerEl.classList.remove('hidden');
// 创建新桶
newBucketsContainerEl.innerHTML = '';
for (let i = 0; i < newCapacity; i++) {
const bucket = createBucket(i);
newBucketsContainerEl.appendChild(bucket);
}
// 逐个迁移元素
setTimeout(() => {
migrateElements(oldCapacity, newCapacity, 0);
}, animationSpeed);
}, animationSpeed);
}
// 迁移元素到新数组
function migrateElements(oldCapacity, newCapacity, elementIndex) {
if (elementIndex >= elements.length) {
// 所有元素迁移完成
setTimeout(() => {
// 更新容量和阈值
capacity = newCapacity;
threshold = capacity * loadFactor;
// 隐藏旧数组，更新显示
oldHashMapContainerEl.classList.add('hidden');
resizeArrowEl.classList.add('hidden');
// 将新数组变为当前数组
setTimeout(() => {
oldBucketsContainerEl.innerHTML = newBucketsContainerEl.innerHTML;
oldCapacityDisplayEl.textContent = capacity;
oldHashMapContainerEl.classList.remove('hidden');
newHashMapContainerEl.classList.add('hidden');
// 更新状态
updateStatusDisplay();
resizeStatusEl.classList.add('hidden');
updateProcessDescription(`扩容完成！新容量: ${capacity}，新阈值: ${threshold.toFixed(1)}`);
isAnimating = false;
addElementsBtn.disabled = false;
// 如果是自动演示，继续
if (isAutoPlaying) {
scheduleNextAutoStep();
}
}, animationSpeed);
}, animationSpeed);
return;
}
// 获取当前元素
const element = elements[elementIndex];
const oldIndex = element.index;
// 计算新索引
const newIndex = calculateNewIndex(element.hashCode, oldCapacity, newCapacity);
element.index = newIndex;
// 获取元素在旧桶中的节点
const oldBucket = oldBucketsContainerEl.querySelector(`.bucket[data-index="${oldIndex}"] .flex-col`);
const node = oldBucket.querySelector(`[data-key="${element.key}"]`);
// 高亮显示旧桶和新桶
const oldBucketEl = oldBucketsContainerEl.querySelector(`.bucket[data-index="${oldIndex}"]`);
const newBucketEl = newBucketsContainerEl.querySelector(`.bucket[data-index="${newIndex}"]`);
oldBucketEl.classList.add('bucket-highlight');
newBucketEl.classList.add('bucket-highlight');
// 更新说明
updateProcessDescription(`迁移元素 ${element.key}=${element.value}: 旧索引 ${oldIndex} → 新索引 ${newIndex}`);
// 准备移动动画
const oldRect = node.getBoundingClientRect();
const newBucketRect = newBucketsContainerEl.querySelector(`.bucket[data-index="${newIndex}"] .flex-col`).getBoundingClientRect();
// 计算位置偏移
const offsetX = newBucketRect.left - oldRect.left;
const offsetY = newBucketRect.top - oldRect.top;
// 应用动画类
node.classList.add('node-moving');
// 执行移动动画
setTimeout(() => {
node.style.transform = `translate(${offsetX}px, ${offsetY}px)`;
// 动画完成后
setTimeout(() => {
// 从旧桶移除
oldBucket.removeChild(node);
// 添加到新桶
const newBucket = newBucketsContainerEl.querySelector(`.bucket[data-index="${newIndex}"] .flex-col`);
newBucket.appendChild(node);
// 重置样式
node.classList.remove('node-moving');
node.style.transform = '';
// 移除高亮
oldBucketEl.classList.remove('bucket-highlight');
newBucketEl.classList.remove('bucket-highlight');
// 处理下一个元素
setTimeout(() => {
migrateElements(oldCapacity, newCapacity, elementIndex + 1);
}, animationSpeed / 3);
}, animationSpeed);
}, 100);
}
// 切换自动演示
function toggleAutoDemo() {
if (isAutoPlaying) {
// 停止自动演示
isAutoPlaying = false;
if (autoPlayInterval) {
clearInterval(autoPlayInterval);
autoPlayInterval = null;
}
autoDemoBtn.innerHTML = '<i class="fa fa-play mr-2"></i> 自动演示';
updateProcessDescription('自动演示已停止');
} else {
// 开始自动演示
isAutoPlaying = true;
autoDemoBtn.innerHTML = '<i class="fa fa-pause mr-2"></i> 暂停演示';
updateProcessDescription('开始自动演示，将持续添加元素直到触发扩容...');
if (!isAnimating) {
scheduleNextAutoStep();
}
}
}
// 安排下一个自动步骤
function scheduleNextAutoStep() {
if (!isAutoPlaying) return;
autoPlayInterval = setTimeout(() => {
if (size < threshold * 1.5) { // 直到扩容后再添加一些元素
const count = parseInt(addCountSelect.value);
addElements(count);
} else {
// 演示完成
toggleAutoDemo();
updateProcessDescription('自动演示完成：已展示完整的扩容过程');
}
}, animationSpeed * 2);
}
// 重置演示
function resetDemo() {
// 清除自动演示计时器
if (autoPlayInterval) {
clearInterval(autoPlayInterval);
autoPlayInterval = null;
}
// 重置状态
capacity = parseInt(initialCapacitySelect.value);
loadFactor = parseFloat(loadFactorSelect.value);
threshold = capacity * loadFactor;
size = 0;
elements = [];
isAnimating = false;
isAutoPlaying = false;
// 重置UI
oldHashMapContainerEl.classList.remove('hidden');
newHashMapContainerEl.classList.add('hidden');
resizeArrowEl.classList.add('hidden');
resizeStatusEl.classList.add('hidden');
autoDemoBtn.innerHTML = '<i class="fa fa-play mr-2"></i> 自动演示';
// 重新初始化桶
initializeBuckets();
// 更新显示
updateStatusDisplay();
updateProcessDescription(`HashMap 已重置：容量为 ${capacity}，阈值为 ${threshold.toFixed(1)} (${capacity} × ${loadFactor})`);
// 启用按钮
addElementsBtn.disabled = false;
}
// 更新状态显示
function updateStatusDisplay() {
currentCapacityEl.textContent = capacity;
elementCountEl.textContent = size;
// 修复阈值计算，使用toFixed处理浮点数精度问题
threshold = capacity * loadFactor;
const displayThreshold = Number.isInteger(threshold) ? threshold : threshold.toFixed(1);
thresholdValueEl.textContent = displayThreshold;
currentLoadFactorEl.textContent = loadFactor;
// 更新进度条
const fillPercentage = Math.min(100, (size / capacity) * 100);
fillProgressEl.style.width = `${fillPercentage}%`;
// 更新阈值标记位置
const thresholdPercentage = (threshold / capacity) * 100;
thresholdMarkerEl.style.left = `${thresholdPercentage}%`;
// 更新标签
thresholdLabelEl.textContent = `阈值 (${displayThreshold})`;
capacityLabelEl.textContent = `容量 (${capacity})`;
// 当接近阈值时改变颜色
if (size >= threshold) {
fillProgressEl.classList.remove('bg-primary');
fillProgressEl.classList.add('bg-warning');
} else {
fillProgressEl.classList.remove('bg-warning');
fillProgressEl.classList.add('bg-primary');
}
}
// 更新过程说明
function updateProcessDescription(text) {
processDescriptionEl.textContent = text;
}
// 生成随机键
function generateRandomKey() {
const chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
const length = Math.floor(Math.random() * 3) + 2; // 2-4个字符
let key = '';
for (let i = 0; i < length; i++) {
key += chars.charAt(Math.floor(Math.random() * chars.length));
}
return key;
}
// 计算哈希码（模拟Java的String.hashCode()）
function calculateHashCode(key) {
let hashCode = 0;
for (let i = 0; i < key.length; i++) {
hashCode = 31 * hashCode + key.charCodeAt(i);
}
// 处理负数，转为无符号表示
return hashCode & 0xFFFFFFFF;
}
// 计算索引
function calculateIndex(hashCode, capacity) {
return hashCode & (capacity - 1);
}
// 计算新索引（利用HashMap扩容优化）
function calculateNewIndex(hashCode, oldCapacity, newCapacity) {
// 新索引 = 旧索引 或 旧索引 + 旧容量
// 取决于hashCode中对应旧容量的那个位是否为1
if ((hashCode & oldCapacity) === 0) {
return calculateIndex(hashCode, oldCapacity);
} else {
return calculateIndex(hashCode, oldCapacity) + oldCapacity;
}
}
</script>
</body>
</html>