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用HTML和CSS打造跨年烟花秀视觉盛宴

news 2026/2/11 0:01:43

一、程序代码

二、代码原理

三、运行效果

一、程序代码

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><title>跨年烟花秀</title><meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no"><meta name="mobile-web-app-capable" content="yes"><meta name="apple-mobile-web-app-capable" content="yes"><meta name="theme-color" content="#000000"><link rel="shortcut icon" type="image/png"href="https://s3-us-west-2.amazonaws.com/s.cdpn.io/329180/firework-burst-icon.png"><link rel="icon" type="image/png"href="https://s3-us-west-2.amazonaws.com/s.cdpn.io/329180/firework-burst-icon.png"><link rel="apple-touch-icon-precomposed"href="https://s3-us-west-2.amazonaws.com/s.cdpn.io/329180/firework-burst-icon.png"><meta name="msapplication-TileColor" content="#000000"><meta name="msapplication-TileImage"content="https://s3-us-west-2.amazonaws.com/s.cdpn.io/329180/firework-burst-icon.png"><link href="https://fonts.googleapis.com/css?family=Russo+One" rel="stylesheet"><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css"><link rel="stylesheet" href="./style.css"><style>* {position: relative;box-sizing: border-box;}html,body {height: 100%;}html {background-color: #000;}body {overflow: hidden;color: rgba(255, 255, 255, 0.5);font-family: "Russo One", arial, sans-serif;line-height: 1.25;letter-spacing: 0.06em;}.hide {opacity: 0;visibility: hidden;}.remove {display: none;}.blur {filter: blur(12px);}.container {height: 100%;display: flex;justify-content: center;align-items: center;}#loading-init {width: 100%;align-self: center;text-align: center;font-size: 2em;}#stage-container {overflow: hidden;box-sizing: initial;border: 1px solid #222;margin: -1px;}#canvas-container {width: 100%;height: 100%;transition: filter 0.3s;}#canvas-container canvas {position: absolute;mix-blend-mode: lighten;}#controls {position: absolute;top: 0;width: 100%;padding-bottom: 50px;display: flex;justify-content: space-between;transition: opacity 0.3s, visibility 0.3s;}@media (min-width: 800px) {#controls {visibility: visible;}#controls.hide:hover {opacity: 1;}}#menu {display: flex;flex-direction: column;justify-content: center;align-items: center;position: absolute;top: 0;bottom: 0;width: 100%;background-color: rgba(0, 0, 0, 0.42);transition: opacity 0.3s, visibility 0.3s;}#menu__header {padding: 20px 0 44px;font-size: 2em;text-transform: uppercase;}#menu form {width: 240px;padding: 0 20px;overflow: auto;}#menu .form-option {margin: 20px 0;}#menu .form-option label {text-transform: uppercase;}#menu .form-option--select label {display: block;margin-bottom: 6px;}#menu .form-option--select select {display: block;width: 100%;height: 30px;font-size: 1rem;font-family: "Russo One", arial, sans-serif;color: rgba(255, 255, 255, 0.5);letter-spacing: 0.06em;background-color: transparent;border: 1px solid rgba(255, 255, 255, 0.5);}#menu .form-option--select select option {background-color: black;}#menu .form-option--checkbox label {display: flex;align-items: center;transition: opacity 0.3s;-webkit-user-select: none;-moz-user-select: none;-ms-user-select: none;user-select: none;}#menu .form-option--checkbox input {display: block;width: 20px;height: 20px;margin-right: 8px;opacity: 0.5;}@media (max-width: 800px) {#menu .form-option select,#menu .form-option input {outline: none;}}#close-menu-btn {position: absolute;top: 0;right: 0;}.btn {opacity: 0.16;width: 44px;height: 44px;display: flex;-webkit-user-select: none;-moz-user-select: none;-ms-user-select: none;user-select: none;cursor: default;transition: opacity 0.3s;}.btn--bright {opacity: 0.5;}@media (min-width: 800px) {.btn:hover {opacity: 0.32;}.btn--bright:hover {opacity: 0.75;}}.btn svg {display: block;margin: auto;}</style>
</head><body><!-- partial:index.partial.html --><!-- SVG Spritesheet --><div style="height: 0; width: 0; position: absolute; visibility: hidden;"><svg xmlns="http://www.w3.org/2000/svg"><symbol id="icon-play" viewBox="0 0 24 24"><path d="M8 5v14l11-7z" /></symbol><symbol id="icon-pause" viewBox="0 0 24 24"><path d="M6 19h4V5H6v14zm8-14v14h4V5h-4z" /></symbol><symbol id="icon-close" viewBox="0 0 24 24"><pathd="M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z" /></symbol><symbol id="icon-settings" viewBox="0 0 24 24"><pathd="M19.43 12.98c.04-.32.07-.64.07-.98s-.03-.66-.07-.98l2.11-1.65c.19-.15.24-.42.12-.64l-2-3.46c-.12-.22-.39-.3-.61-.22l-2.49 1c-.52-.4-1.08-.73-1.69-.98l-.38-2.65C14.46 2.18 14.25 2 14 2h-4c-.25 0-.46.18-.49.42l-.38 2.65c-.61.25-1.17.59-1.69.98l-2.49-1c-.23-.09-.49 0-.61.22l-2 3.46c-.13.22-.07.49.12.64l2.11 1.65c-.04.32-.07.65-.07.98s.03.66.07.98l-2.11 1.65c-.19.15-.24.42-.12.64l2 3.46c.12.22.39.3.61.22l2.49-1c.52.4 1.08.73 1.69.98l.38 2.65c.03.24.24.42.49.42h4c.25 0 .46-.18.49-.42l.38-2.65c.61-.25 1.17-.59 1.69-.98l2.49 1c.23.09.49 0 .61-.22l2-3.46c.12-.22.07-.49-.12-.64l-2.11-1.65zM12 15.5c-1.93 0-3.5-1.57-3.5-3.5s1.57-3.5 3.5-3.5 3.5 1.57 3.5 3.5-1.57 3.5-3.5 3.5z" /></symbol><symbol id="icon-shutter-fast" viewBox="0 0 24 24"><pathd="M21 19V5c0-1.1-.9-2-2-2H5c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h14c1.1 0 2-.9 2-2zM8.5 13.5l2.5 3.01L14.5 12l4.5 6H5l3.5-4.5z" /></symbol><symbol id="icon-shutter-slow" viewBox="0 0 24 24"><pathd="M1 5h2v14H1zm4 0h2v14H5zm17 0H10c-.55 0-1 .45-1 1v12c0 .55.45 1 1 1h12c.55 0 1-.45 1-1V6c0-.55-.45-1-1-1zM11 17l2.5-3.15L15.29 16l2.5-3.22L21 17H11z" /></symbol></svg></div><!-- App --><div class="container"><div id="loading-init">惊喜即将来临！</div><div id="stage-container" class="remove"><div id="canvas-container"><canvas id="trails-canvas"></canvas><canvas id="main-canvas"></canvas></div><div id="controls"><div id="pause-btn" class="btn"><svg fill="white" width="24" height="24"><use href="#icon-pause"></use></svg></div><div id="shutter-btn" class="btn"><svg fill="white" width="24" height="24"><use href="#icon-shutter-slow"></use></svg></div><div id="settings-btn" class="btn"><svg fill="white" width="24" height="24"><use href="#icon-settings"></use></svg></div></div><div id="menu" class="hide"><div id="close-menu-btn" class="btn btn--bright"><svg fill="white" width="24" height="24"><use href="#icon-close"></use></svg></div><div id="menu__header">Settings</div><form><div class="form-option form-option--select"><label>Shell Type</label><select id="shell-type"></select></div><div class="form-option form-option--select"><label>Shell Size</label><select id="shell-size"></select></div><div class="form-option form-option--checkbox"><label id="auto-launch-label"><input id="auto-launch" type="checkbox" /><span>AutoFire</span></label></div><div class="form-option form-option--checkbox"><label id="finale-mode-label"><input id="finale-mode" type="checkbox" /><span>FinaleMode</span></label></div><div class="form-option form-option--checkbox"><label id="hide-controls-label"><input id="hide-controls" type="checkbox" /><span>HideControls</span></label></div></form></div></div></div><!-- partial --><script src='https://s3-us-west-2.amazonaws.com/s.cdpn.io/329180/fscreen%401.0.1.js'></script><script src='https://s3-us-west-2.amazonaws.com/s.cdpn.io/329180/Stage%400.1.4.js'></script><script src='https://s3-us-west-2.amazonaws.com/s.cdpn.io/329180/MyMath.js'></script><script>'use strict';console.clear();const IS_MOBILE = window.innerWidth <= 640;const IS_DESKTOP = window.innerWidth > 800;const IS_HEADER = IS_DESKTOP && window.innerHeight < 300;// 8K - can restrict this if neededconst MAX_WIDTH = 7680;const MAX_HEIGHT = 4320;const GRAVITY = 0.9; // Acceleration in px/slet simSpeed = 1;const COLOR = {Red: '#ff0043',Green: '#14fc56',Blue: '#1e7fff',Purple: '#e60aff',Gold: '#ffae00',White: '#ffffff'};// Special invisible color (not rendered, and therefore not in COLOR map)const INVISIBLE = '_INVISIBLE_';// Interactive state managementconst store = {_listeners: new Set(),_dispatch() {this._listeners.forEach(listener => listener(this.state))},state: {paused: false,longExposure: false,menuOpen: false,config: {shell: 'Random',size: IS_DESKTOP && !IS_HEADER ? '3' : '1',autoLaunch: true,finale: false,hideControls: IS_HEADER}},setState(nextState) {this.state = Object.assign({}, this.state, nextState);this._dispatch();this.persist();},subscribe(listener) {this._listeners.add(listener);return () => this._listeners.remove(listener);},// Load / persist select state to localStorageload() {if (localStorage.getItem('schemaVersion') === '1') {this.state.config.size = JSON.parse(localStorage.getItem('configSize'));this.state.config.hideControls = JSON.parse(localStorage.getItem('hideControls'));}},persist() {localStorage.setItem('schemaVersion', '1');localStorage.setItem('configSize', JSON.stringify(this.state.config.size));localStorage.setItem('hideControls', JSON.stringify(this.state.config.hideControls));}};if (!IS_HEADER) {store.load();}// Actions// ---------function togglePause(toggle) {if (typeof toggle === 'boolean') {store.setState({ paused: toggle });} else {store.setState({ paused: !store.state.paused });}}function toggleLongExposure(toggle) {if (typeof toggle === 'boolean') {store.setState({ longExposure: toggle });} else {store.setState({ longExposure: !store.state.longExposure });}}function toggleMenu(toggle) {if (typeof toggle === 'boolean') {store.setState({ menuOpen: toggle });} else {store.setState({ menuOpen: !store.state.menuOpen });}}function updateConfig(nextConfig) {nextConfig = nextConfig || getConfigFromDOM();store.setState({config: Object.assign({}, store.state.config, nextConfig)});}// Selectors// -----------const canInteract = () => !store.state.paused && !store.state.menuOpen;const shellNameSelector = () => store.state.config.shell;// Converts shell size to number.const shellSizeSelector = () => +store.state.config.size;const finaleSelector = () => store.state.config.finale;// Render app UI / keep in sync with stateconst appNodes = {stageContainer: '#stage-container',canvasContainer: '#canvas-container',controls: '#controls',menu: '#menu',pauseBtn: '#pause-btn',pauseBtnSVG: '#pause-btn use',shutterBtn: '#shutter-btn',shutterBtnSVG: '#shutter-btn use',shellType: '#shell-type',shellSize: '#shell-size',autoLaunch: '#auto-launch',autoLaunchLabel: '#auto-launch-label',finaleMode: '#finale-mode',finaleModeLabel: '#finale-mode-label',hideControls: '#hide-controls',hideControlsLabel: '#hide-controls-label'};// Convert appNodes selectors to dom nodesObject.keys(appNodes).forEach(key => {appNodes[key] = document.querySelector(appNodes[key]);});// Remove loading statedocument.getElementById('loading-init').remove();appNodes.stageContainer.classList.remove('remove');// First render is called in init()function renderApp(state) {appNodes.pauseBtnSVG.setAttribute('href', `#icon-${state.paused ? 'play' : 'pause'}`);appNodes.shutterBtnSVG.setAttribute('href', `#icon-shutter-${state.longExposure ? 'fast' : 'slow'}`);appNodes.controls.classList.toggle('hide', state.menuOpen || state.config.hideControls);appNodes.canvasContainer.classList.toggle('blur', state.menuOpen);appNodes.menu.classList.toggle('hide', !state.menuOpen);appNodes.finaleModeLabel.style.opacity = state.config.autoLaunch ? 1 : 0.32;appNodes.shellType.value = state.config.shell;appNodes.shellSize.value = state.config.size;appNodes.autoLaunch.checked = state.config.autoLaunch;appNodes.finaleMode.checked = state.config.finale;appNodes.hideControls.checked = state.config.hideControls;}store.subscribe(renderApp);function getConfigFromDOM() {return {shell: appNodes.shellType.value,size: appNodes.shellSize.value,autoLaunch: appNodes.autoLaunch.checked,finale: appNodes.finaleMode.checked,hideControls: appNodes.hideControls.checked};};const updateConfigNoEvent = () => updateConfig();appNodes.shellType.addEventListener('input', updateConfigNoEvent);appNodes.shellSize.addEventListener('input', updateConfigNoEvent);appNodes.autoLaunchLabel.addEventListener('click', () => setTimeout(updateConfig, 0));appNodes.finaleModeLabel.addEventListener('click', () => setTimeout(updateConfig, 0));appNodes.hideControlsLabel.addEventListener('click', () => setTimeout(updateConfig, 0));// Constant derivationsconst COLOR_NAMES = Object.keys(COLOR);const COLOR_CODES = COLOR_NAMES.map(colorName => COLOR[colorName]);// Invisible stars need an indentifier, even through they won't be rendered - physics still apply.const COLOR_CODES_W_INVIS = [...COLOR_CODES, INVISIBLE];// Tuples is a map keys by color codes (hex) with values of { r, g, b } tuples (still just objects).const COLOR_TUPLES = {};COLOR_CODES.forEach(hex => {COLOR_TUPLES[hex] = {r: parseInt(hex.substr(1, 2), 16),g: parseInt(hex.substr(3, 2), 16),b: parseInt(hex.substr(5, 2), 16),};});// Get a random color.function randomColorSimple() {return COLOR_CODES[Math.random() * COLOR_CODES.length | 0];}// Get a random color, with some customization options available.let lastColor;function randomColor(options) {const notSame = options && options.notSame;const notColor = options && options.notColor;const limitWhite = options && options.limitWhite;let color = randomColorSimple();// limit the amount of white chosen randomlyif (limitWhite && color === COLOR.White && Math.random() < 0.6) {color = randomColorSimple();}if (notSame) {while (color === lastColor) {color = randomColorSimple();}}else if (notColor) {while (color === notColor) {color = randomColorSimple();}}lastColor = color;return color;}function whiteOrGold() {return Math.random() < 0.5 ? COLOR.Gold : COLOR.White;}const PI_2 = Math.PI * 2;const PI_HALF = Math.PI * 0.5;const trailsStage = new Stage('trails-canvas');const mainStage = new Stage('main-canvas');const stages = [trailsStage,mainStage];// Fill trails canvas with black to start.trailsStage.ctx.fillStyle = '#000';trailsStage.ctx.fillRect(0, 0, trailsStage.width, trailsStage.height);// Fullscreen helpers, using Fscreen for prefixesfunction requestFullscreen() {if (fullscreenEnabled() && !isFullscreen()) {fscreen.requestFullscreen(document.documentElement);}}function fullscreenEnabled() {return fscreen.fullscreenEnabled;}function isFullscreen() {return !!fscreen.fullscreenElement;}// Shell helpersfunction makePistilColor(shellColor) {return (shellColor === COLOR.White || shellColor === COLOR.Gold) ? randomColor({ notColor: shellColor }) : whiteOrGold();}// Unique shell typesconst crysanthemumShell = (size = 1) => {const glitter = Math.random() < 0.25;const singleColor = Math.random() < 0.68;const color = singleColor ? randomColor({ limitWhite: true }) : [randomColor(), randomColor({ notSame: true })];const pistil = singleColor && Math.random() < 0.42;const pistilColor = makePistilColor(color);const streamers = !pistil && color !== COLOR.White && Math.random() < 0.42;return {size: 300 + size * 100,starLife: 900 + size * 200,starDensity: glitter ? 1.1 : 1.5,color,glitter: glitter ? 'light' : '',glitterColor: whiteOrGold(),pistil,pistilColor,streamers};};const palmShell = (size = 1) => ({size: 250 + size * 75,starDensity: 0.6,starLife: 1800 + size * 200,glitter: 'heavy'});const ringShell = (size = 1) => {const color = randomColor();const pistil = Math.random() < 0.75;return {ring: true,color,size: 300 + size * 100,starLife: 900 + size * 200,starCount: 2.2 * PI_2 * (size + 1),pistil,pistilColor: makePistilColor(color),glitter: !pistil ? 'light' : '',glitterColor: color === COLOR.Gold ? COLOR.Gold : COLOR.White};};const crossetteShell = (size = 1) => {const color = randomColor({ limitWhite: true });return {size: 300 + size * 100,starLife: 900 + size * 200,starLifeVariation: 0.22,color,crossette: true,pistil: Math.random() < 0.5,pistilColor: makePistilColor(color)};};const floralShell = (size = 1) => ({size: 300 + size * 120,starDensity: 0.38,starLife: 500 + size * 50,starLifeVariation: 0.5,color: Math.random() < 0.65 ? 'random' : (Math.random() < 0.15 ? randomColor() : [randomColor(), randomColor({ notSame: true })]),floral: true});const fallingLeavesShell = (size = 1) => ({color: INVISIBLE,size: 300 + size * 120,starDensity: 0.38,starLife: 500 + size * 50,starLifeVariation: 0.5,glitter: 'medium',glitterColor: COLOR.Gold,fallingLeaves: true});const willowShell = (size = 1) => ({size: 300 + size * 100,starDensity: 0.7,starLife: 3000 + size * 300,glitter: 'willow',glitterColor: COLOR.Gold,color: INVISIBLE});const crackleShell = (size = 1) => {// favor goldconst color = Math.random() < 0.75 ? COLOR.Gold : randomColor();return {size: 380 + size * 75,starDensity: 1,starLife: 600 + size * 100,starLifeVariation: 0.32,glitter: 'light',glitterColor: COLOR.Gold,color,crackle: true,pistil: Math.random() < 0.65,pistilColor: makePistilColor(color)};};const horsetailShell = (size = 1) => {const color = randomColor();return {horsetail: true,color,size: 250 + size * 38,starDensity: 0.85 + size * 0.1,starLife: 2500 + size * 300,glitter: 'medium',glitterColor: Math.random() < 0.5 ? whiteOrGold() : color};};function randomShellName() {return Math.random() < 0.6 ? 'Crysanthemum' : shellNames[(Math.random() * (shellNames.length - 1) + 1) | 0];}function randomShell(size) {return shellTypes[randomShellName()](size);}function shellFromConfig(size) {return shellTypes[shellNameSelector()](size);}// Get a random shell, not including processing intensive varients// Note this is only random when "Random" shell is selected in config.// Also, this does not create the shell, only returns the factory function.const fastShellBlacklist = ['Falling Leaves', 'Floral', 'Willow'];function randomFastShell() {const isRandom = shellNameSelector() === 'Random';let shellName = isRandom ? randomShellName() : shellNameSelector();if (isRandom) {while (fastShellBlacklist.includes(shellName)) {shellName = randomShellName();}}return shellTypes[shellName];}const shellTypes = {'Random': randomShell,'Crackle': crackleShell,'Crossette': crossetteShell,'Crysanthemum': crysanthemumShell,'Falling Leaves': fallingLeavesShell,'Floral': floralShell,'Horse Tail': horsetailShell,'Palm': palmShell,'Ring': ringShell,'Willow': willowShell};const shellNames = Object.keys(shellTypes);function init() {// Populate dropdowns// shell typelet options = '';shellNames.forEach(opt => options += `<option value="${opt}">${opt}</option>`);appNodes.shellType.innerHTML = options;// shell sizeoptions = '';['3"', '5"', '6"', '8"', '12"'].forEach((opt, i) => options += `<option value="${i}">${opt}</option>`);appNodes.shellSize.innerHTML = options;// initial renderrenderApp(store.state);}function fitShellPositionInBoundsH(position) {const edge = 0.18;return (1 - edge * 2) * position + edge;}function fitShellPositionInBoundsV(position) {return position * 0.75;}function getRandomShellPositionH() {return fitShellPositionInBoundsH(Math.random());}function getRandomShellPositionV() {return fitShellPositionInBoundsV(Math.random());}function getRandomShellSize() {const baseSize = shellSizeSelector();const maxVariance = Math.min(2.5, baseSize);const variance = Math.random() * maxVariance;const size = baseSize - variance;const height = maxVariance === 0 ? Math.random() : 1 - (variance / maxVariance);const centerOffset = Math.random() * (1 - height * 0.65) * 0.5;const x = Math.random() < 0.5 ? 0.5 - centerOffset : 0.5 + centerOffset;return {size,x: fitShellPositionInBoundsH(x),height: fitShellPositionInBoundsV(height)};}// Launches a shell from a user pointer event, based on state.configfunction launchShellFromConfig(event) {const shell = new Shell(shellFromConfig(shellSizeSelector()));const w = mainStage.width;const h = mainStage.height;shell.launch(event ? event.x / w : getRandomShellPositionH(),event ? 1 - event.y / h : getRandomShellPositionV());}// Sequences// -----------function seqRandomShell() {const size = getRandomShellSize();const shell = new Shell(shellFromConfig(size.size));shell.launch(size.x, size.height);let extraDelay = shell.starLife;if (shell.fallingLeaves) {extraDelay = 4000;}return 900 + Math.random() * 600 + extraDelay;}function seqTwoRandom() {const size1 = getRandomShellSize();const size2 = getRandomShellSize();const shell1 = new Shell(shellFromConfig(size1.size));const shell2 = new Shell(shellFromConfig(size2.size));const leftOffset = Math.random() * 0.2 - 0.1;const rightOffset = Math.random() * 0.2 - 0.1;shell1.launch(0.3 + leftOffset, size1.height);shell2.launch(0.7 + rightOffset, size2.height);let extraDelay = Math.max(shell1.starLife, shell2.starLife);if (shell1.fallingLeaves || shell2.fallingLeaves) {extraDelay = 4000;}return 900 + Math.random() * 600 + extraDelay;}function seqTriple() {const shellType = randomFastShell();const baseSize = shellSizeSelector();const smallSize = Math.max(0, baseSize - 1.25);const offset = Math.random() * 0.08 - 0.04;const shell1 = new Shell(shellType(baseSize));shell1.launch(0.5 + offset, 0.7);const leftDelay = 1000 + Math.random() * 400;const rightDelay = 1000 + Math.random() * 400;setTimeout(() => {const offset = Math.random() * 0.08 - 0.04;const shell2 = new Shell(shellType(smallSize));shell2.launch(0.2 + offset, 0.1);}, leftDelay);setTimeout(() => {const offset = Math.random() * 0.08 - 0.04;const shell3 = new Shell(shellType(smallSize));shell3.launch(0.8 + offset, 0.1);}, rightDelay);return 4000;}function seqSmallBarrage() {seqSmallBarrage.lastCalled = Date.now();const barrageCount = IS_DESKTOP ? 11 : 5;const shellSize = Math.max(0, shellSizeSelector() - 2);const useCrysanthemum = Math.random() < 0.7;// (cos(x*5π+0.5π)+1)/2 is a custom wave bounded by 0 and 1 used to set varying launch heightsfunction launchShell(x) {const isRandom = shellNameSelector() === 'Random';let shellType = isRandom ? (useCrysanthemum ? crysanthemumShell : randomFastShell()) : shellTypes[shellNameSelector()];const shell = new Shell(shellType(shellSize));const height = (Math.cos(x * 5 * Math.PI + PI_HALF) + 1) / 2;shell.launch(x, height * 0.75);}let count = 0;let delay = 0;while (count < barrageCount) {if (count === 0) {launchShell(0.5)count += 1;}else {const offset = (count + 1) / barrageCount / 2;setTimeout(() => {launchShell(0.5 + offset);launchShell(0.5 - offset);}, delay);count += 2;}delay += 200;}return 3400 + barrageCount * 120;}seqSmallBarrage.cooldown = 15000;seqSmallBarrage.lastCalled = Date.now();const sequences = [seqRandomShell,seqTwoRandom,seqTriple,seqSmallBarrage];let isFirstSeq = true;const finaleCount = 32;let currentFinaleCount = 0;function startSequence() {if (isFirstSeq) {isFirstSeq = false;const shell = new Shell(crysanthemumShell(shellSizeSelector()));shell.launch(0.5, 0.5);return 2400;}if (finaleSelector()) {seqRandomShell();if (currentFinaleCount < finaleCount) {currentFinaleCount++;return 170;}else {currentFinaleCount = 0;return 6000;}}const rand = Math.random();if (rand < 0.2 && Date.now() - seqSmallBarrage.lastCalled > seqSmallBarrage.cooldown) {return seqSmallBarrage();}if (rand < 0.6) {return seqRandomShell();}else if (rand < 0.8) {return seqTwoRandom();}else if (rand < 1) {return seqTriple();}}let activePointerCount = 0;let isUpdatingSpeed = false;function handlePointerStart(event) {activePointerCount++;const btnSize = 44;if (event.y < btnSize) {if (event.x < btnSize) {togglePause();return;}if (event.x > mainStage.width / 2 - btnSize / 2 && event.x < mainStage.width / 2 + btnSize / 2) {toggleLongExposure();return;}if (event.x > mainStage.width - btnSize) {toggleMenu();return;}}if (!canInteract()) return;if (updateSpeedFromEvent(event)) {isUpdatingSpeed = true;}else if (event.onCanvas) {launchShellFromConfig(event);}}function handlePointerEnd(event) {activePointerCount--;isUpdatingSpeed = false;}function handlePointerMove(event) {if (!canInteract()) return;if (isUpdatingSpeed) {updateSpeedFromEvent(event);}}function handleKeydown(event) {// Pif (event.keyCode === 80) {togglePause();}// Oelse if (event.keyCode === 79) {toggleMenu();}// Escelse if (event.keyCode === 27) {toggleMenu(false);}}mainStage.addEventListener('pointerstart', handlePointerStart);mainStage.addEventListener('pointerend', handlePointerEnd);mainStage.addEventListener('pointermove', handlePointerMove);window.addEventListener('keydown', handleKeydown);// Try to go fullscreen upon a touchwindow.addEventListener('touchend', (event) => !IS_DESKTOP && requestFullscreen());function handleResize() {const w = window.innerWidth;const h = window.innerHeight;// Try to adopt screen size, heeding maximum sizes specifiedconst containerW = Math.min(w, MAX_WIDTH);// On small screens, use full device heightconst containerH = w <= 420 ? h : Math.min(h, MAX_HEIGHT);appNodes.stageContainer.style.width = containerW + 'px';appNodes.stageContainer.style.height = containerH + 'px';stages.forEach(stage => stage.resize(containerW, containerH));}// Compute initial dimensionshandleResize();window.addEventListener('resize', handleResize);// Dynamic globalslet speedBarOpacity = 0;let autoLaunchTime = 0;function updateSpeedFromEvent(event) {if (isUpdatingSpeed || event.y >= mainStage.height - 44) {// On phones it's hard to hit the edge pixels in order to set speed at 0 or 1, so some padding is provided to make that easier.const edge = 16;const newSpeed = (event.x - edge) / (mainStage.width - edge * 2);simSpeed = Math.min(Math.max(newSpeed, 0), 1);// show speed bar after an updatespeedBarOpacity = 1;// If we updated the speed, return truereturn true;}// Return false if the speed wasn't updatedreturn false;}// Extracted function to keep `update()` optimizedfunction updateGlobals(timeStep, lag) {// Always try to fade out speed barif (!isUpdatingSpeed) {speedBarOpacity -= lag / 30; // half a secondif (speedBarOpacity < 0) {speedBarOpacity = 0;}}// auto launch shellsif (store.state.config.autoLaunch) {autoLaunchTime -= timeStep;if (autoLaunchTime <= 0) {autoLaunchTime = startSequence();}}}function update(frameTime, lag) {if (!canInteract()) return;const { width, height } = mainStage;const timeStep = frameTime * simSpeed;const speed = simSpeed * lag;updateGlobals(timeStep, lag);const starDrag = 1 - (1 - Star.airDrag) * speed;const starDragHeavy = 1 - (1 - Star.airDragHeavy) * speed;const sparkDrag = 1 - (1 - Spark.airDrag) * speed;const gAcc = timeStep / 1000 * GRAVITY;COLOR_CODES_W_INVIS.forEach(color => {// StarsStar.active[color].forEach((star, i, stars) => {star.life -= timeStep;if (star.life <= 0) {stars.splice(i, 1);Star.returnInstance(star);} else {star.prevX = star.x;star.prevY = star.y;star.x += star.speedX * speed;star.y += star.speedY * speed;// Apply air drag if star isn't "heavy". The heavy property is used for the shell comets.if (!star.heavy) {star.speedX *= starDrag;star.speedY *= starDrag;}else {star.speedX *= starDragHeavy;star.speedY *= starDragHeavy;}star.speedY += gAcc;if (star.spinRadius) {star.spinAngle += star.spinSpeed * speed;star.x += Math.sin(star.spinAngle) * star.spinRadius * speed;star.y += Math.cos(star.spinAngle) * star.spinRadius * speed;}if (star.sparkFreq) {star.sparkTimer -= timeStep;while (star.sparkTimer < 0) {star.sparkTimer += star.sparkFreq;Spark.add(star.x,star.y,star.sparkColor,Math.random() * PI_2,Math.random() * star.sparkSpeed,star.sparkLife * 0.8 + Math.random() * star.sparkLifeVariation * star.sparkLife);}}}});// SparksSpark.active[color].forEach((spark, i, sparks) => {spark.life -= timeStep;if (spark.life <= 0) {sparks.splice(i, 1);Spark.returnInstance(spark);} else {spark.prevX = spark.x;spark.prevY = spark.y;spark.x += spark.speedX * speed;spark.y += spark.speedY * speed;spark.speedX *= sparkDrag;spark.speedY *= sparkDrag;spark.speedY += gAcc;}});});render(speed);}function render(speed) {const { dpr, width, height } = mainStage;const trailsCtx = trailsStage.ctx;const mainCtx = mainStage.ctx;colorSky(speed);trailsCtx.scale(dpr, dpr);mainCtx.scale(dpr, dpr);trailsCtx.globalCompositeOperation = 'source-over';trailsCtx.fillStyle = `rgba(0, 0, 0, ${store.state.longExposure ? 0.0025 : 0.1 * speed})`;trailsCtx.fillRect(0, 0, width, height);// Remaining drawing on trails canvas will use 'lighten' blend modetrailsCtx.globalCompositeOperation = 'lighten';mainCtx.clearRect(0, 0, width, height);// Draw queued burst flasheswhile (BurstFlash.active.length) {const bf = BurstFlash.active.pop();const burstGradient = trailsCtx.createRadialGradient(bf.x, bf.y, 0, bf.x, bf.y, bf.radius);burstGradient.addColorStop(0.05, 'white');burstGradient.addColorStop(0.25, 'rgba(255, 160, 20, 0.2)');burstGradient.addColorStop(1, 'rgba(255, 160, 20, 0)');trailsCtx.fillStyle = burstGradient;trailsCtx.fillRect(bf.x - bf.radius, bf.y - bf.radius, bf.radius * 2, bf.radius * 2);BurstFlash.returnInstance(bf);}// Draw starstrailsCtx.lineWidth = Star.drawWidth;trailsCtx.lineCap = 'round';mainCtx.strokeStyle = '#fff';mainCtx.lineWidth = 1;mainCtx.beginPath();COLOR_CODES.forEach(color => {const stars = Star.active[color];trailsCtx.strokeStyle = color;trailsCtx.beginPath();stars.forEach(star => {trailsCtx.moveTo(star.x, star.y);trailsCtx.lineTo(star.prevX, star.prevY);mainCtx.moveTo(star.x, star.y);mainCtx.lineTo(star.x - star.speedX * 1.6, star.y - star.speedY * 1.6);});trailsCtx.stroke();});mainCtx.stroke();// Draw sparkstrailsCtx.lineWidth = Spark.drawWidth;trailsCtx.lineCap = 'butt';COLOR_CODES.forEach(color => {const sparks = Spark.active[color];trailsCtx.strokeStyle = color;trailsCtx.beginPath();sparks.forEach(spark => {trailsCtx.moveTo(spark.x, spark.y);trailsCtx.lineTo(spark.prevX, spark.prevY);});trailsCtx.stroke();});// Render speed bar if visibleif (speedBarOpacity) {const speedBarHeight = 6;mainCtx.globalAlpha = speedBarOpacity;mainCtx.fillStyle = COLOR.Blue;mainCtx.fillRect(0, height - speedBarHeight, width * simSpeed, speedBarHeight);mainCtx.globalAlpha = 1;}trailsCtx.resetTransform();mainCtx.resetTransform();}// Draw colored overlay based on combined brightness of stars (light up the sky!)// Note: this is applied to the canvas container's background-color, so it's behind the particlesconst currentSkyColor = { r: 0, g: 0, b: 0 };const targetSkyColor = { r: 0, g: 0, b: 0 };function colorSky(speed) {// The maximum r, g, or b value that will be used (255 would represent no maximum)const maxSkySaturation = 30;// How many stars are required in total to reach maximum sky brightnessconst maxStarCount = 500;let totalStarCount = 0;// Initialize sky as blacktargetSkyColor.r = 0;targetSkyColor.g = 0;targetSkyColor.b = 0;// Add each known color to sky, multiplied by particle count of that color. This will put RGB values wildly out of bounds, but we'll scale them back later.// Also add up total star count.COLOR_CODES.forEach(color => {const tuple = COLOR_TUPLES[color];const count = Star.active[color].length;totalStarCount += count;targetSkyColor.r += tuple.r * count;targetSkyColor.g += tuple.g * count;targetSkyColor.b += tuple.b * count;});// Clamp intensity at 1.0, and map to a custom non-linear curve. This allows few stars to perceivably light up the sky, while more stars continue to increase the brightness but at a lesser rate. This is more inline with humans' non-linear brightness perception.const intensity = Math.pow(Math.min(1, totalStarCount / maxStarCount), 0.3);// Figure out which color component has the highest value, so we can scale them without affecting the ratios.// Prevent 0 from being used, so we don't divide by zero in the next step.const maxColorComponent = Math.max(1, targetSkyColor.r, targetSkyColor.g, targetSkyColor.b);// Scale all color components to a max of `maxSkySaturation`, and apply intensity.targetSkyColor.r = targetSkyColor.r / maxColorComponent * maxSkySaturation * intensity;targetSkyColor.g = targetSkyColor.g / maxColorComponent * maxSkySaturation * intensity;targetSkyColor.b = targetSkyColor.b / maxColorComponent * maxSkySaturation * intensity;// Animate changes to color to smooth out transitions.const colorChange = 10;currentSkyColor.r += (targetSkyColor.r - currentSkyColor.r) / colorChange * speed;currentSkyColor.g += (targetSkyColor.g - currentSkyColor.g) / colorChange * speed;currentSkyColor.b += (targetSkyColor.b - currentSkyColor.b) / colorChange * speed;appNodes.canvasContainer.style.backgroundColor = `rgb(${currentSkyColor.r | 0}, ${currentSkyColor.g | 0}, ${currentSkyColor.b | 0})`;}mainStage.addEventListener('ticker', update);// Helper used to semi-randomly spread particles over an arc// Values are flexible - `start` and `arcLength` can be negative, and `randomness` is simply a multiplier for random addition.function createParticleArc(start, arcLength, count, randomness, particleFactory) {const angleDelta = arcLength / count;// Sometimes there is an extra particle at the end, too close to the start. Subtracting half the angleDelta ensures that is skipped.// Would be nice to fix this a better way.const end = start + arcLength - (angleDelta * 0.5);if (end > start) {// Optimization: `angle=angle+angleDelta` vs. angle+=angleDelta// V8 deoptimises with let compound assignmentfor (let angle = start; angle < end; angle = angle + angleDelta) {particleFactory(angle + Math.random() * angleDelta * randomness);}}else {for (let angle = start; angle > end; angle = angle + angleDelta) {particleFactory(angle + Math.random() * angleDelta * randomness);}}}// Various star effects.// These are designed to be attached to a star's `onDeath` event.// Crossette breaks star into four same-color pieces which branch in a cross-like shape.function crossetteEffect(star) {const startAngle = Math.random() * PI_HALF;createParticleArc(startAngle, PI_2, 4, 0.5, (angle) => {Star.add(star.x,star.y,star.color,angle,Math.random() * 0.6 + 0.75,600);});}// Flower is like a mini shellfunction floralEffect(star) {const startAngle = Math.random() * PI_HALF;createParticleArc(startAngle, PI_2, 24, 1, (angle) => {Star.add(star.x,star.y,star.color,angle,// apply near cubic falloff to speed (places more particles towards outside)Math.pow(Math.random(), 0.45) * 2.4,1000 + Math.random() * 300,star.speedX,star.speedY);});// Queue burst flash renderBurstFlash.add(star.x, star.y, 24);}// Floral burst with willow starsfunction fallingLeavesEffect(star) {const startAngle = Math.random() * PI_HALF;createParticleArc(startAngle, PI_2, 12, 1, (angle) => {const newStar = Star.add(star.x,star.y,INVISIBLE,angle,// apply near cubic falloff to speed (places more particles towards outside)Math.pow(Math.random(), 0.45) * 2.4,2400 + Math.random() * 600,star.speedX,star.speedY);newStar.sparkColor = COLOR.Gold;newStar.sparkFreq = 72;newStar.sparkSpeed = 0.28;newStar.sparkLife = 750;newStar.sparkLifeVariation = 3.2;});// Queue burst flash renderBurstFlash.add(star.x, star.y, 24);}// Crackle pops into a small cloud of golden sparks.function crackleEffect(star) {createParticleArc(0, PI_2, 10, 1.8, (angle) => {Spark.add(star.x,star.y,COLOR.Gold,angle,// apply near cubic falloff to speed (places more particles towards outside)Math.pow(Math.random(), 0.45) * 2.4,300 + Math.random() * 200);});}/*** Shell can be constructed with options:** size:      Size of the burst.* starCount: Number of stars to create. This is optional, and will be set to a reasonable quantity for size if omitted.* starLife:* starLifeVariation:* color:* glitterColor:* glitter: One of: 'light', 'medium', 'heavy', 'streamer', 'willow'* pistil:* pistilColor:* streamers:* crossette:* floral:* crackle:*/class Shell {constructor(options) {Object.assign(this, options);this.starLifeVariation = options.starLifeVariation || 0.125;this.color = options.color || randomColor();this.glitterColor = options.glitterColor || this.color;// Set default starCount if needed, will be based on shell size and scale exponentially, like a sphere's surface area.if (!this.starCount) {const density = options.starDensity || 1;const scaledSize = this.size / 50 * density;this.starCount = scaledSize * scaledSize;}}launch(position, launchHeight) {const { width, height } = mainStage;// Distance from sides of screen to keep shells.const hpad = 60;// Distance from top of screen to keep shell bursts.const vpad = 50;// Minimum burst height, as a percentage of stage heightconst minHeightPercent = 0.45;// Minimum burst height in pxconst minHeight = height - height * minHeightPercent;const launchX = position * (width - hpad * 2) + hpad;const launchY = height;const burstY = minHeight - (launchHeight * (minHeight - vpad));const launchDistance = launchY - burstY;// Using a custom power curve to approximate Vi needed to reach launchDistance under gravity and air drag.// Magic numbers came from testing.const launchVelocity = Math.pow(launchDistance * 0.04, 0.64);const comet = this.comet = Star.add(launchX,launchY,typeof this.color === 'string' && this.color !== 'random' ? this.color : COLOR.White,Math.PI,launchVelocity * (this.horsetail ? 1.2 : 1),// Hang time is derived linearly from Vi; exact number came from testinglaunchVelocity * (this.horsetail ? 100 : 400));// making comet "heavy" limits air dragcomet.heavy = true;// comet spark trailcomet.spinRadius = 0.78;comet.sparkFreq = 16;if (this.glitter === 'willow' || this.fallingLeaves) {comet.sparkFreq = 10;comet.sparkSpeed = 0.5;comet.sparkLife = 500;comet.sparkLifeVariation = 3;}if (this.color === INVISIBLE) {comet.sparkColor = COLOR.Gold;}comet.onDeath = comet => this.burst(comet.x, comet.y);// comet.onDeath = () => this.burst(launchX, burstY);}burst(x, y) {// Set burst speed so overall burst grows to set size. This specific formula was derived from testing, and is affected by simulated air drag.const speed = this.size / 96;let color, onDeath, sparkFreq, sparkSpeed, sparkLife;let sparkLifeVariation = 0.25;if (this.crossette) onDeath = crossetteEffect;if (this.floral) onDeath = floralEffect;if (this.crackle) onDeath = crackleEffect;if (this.fallingLeaves) onDeath = fallingLeavesEffect;if (this.glitter === 'light') {sparkFreq = 200;sparkSpeed = 0.25;sparkLife = 600;}else if (this.glitter === 'medium') {sparkFreq = 100;sparkSpeed = 0.36;sparkLife = 1400;}else if (this.glitter === 'heavy') {sparkFreq = 42;sparkSpeed = 0.62;sparkLife = 2800;}else if (this.glitter === 'streamer') {sparkFreq = 20;sparkSpeed = 0.75;sparkLife = 800;}else if (this.glitter === 'willow') {sparkFreq = 72;sparkSpeed = 0.28;sparkLife = 1000;sparkLifeVariation = 3.4;}const starFactory = angle => {const star = Star.add(x,y,color || randomColor(),angle,// apply near cubic falloff to speed (places more particles towards outside)Math.pow(Math.random(), 0.45) * speed,// add minor variation to star lifethis.starLife + Math.random() * this.starLife * this.starLifeVariation,this.horsetail && this.comet && this.comet.speedX,this.horsetail && this.comet && this.comet.speedY);star.onDeath = onDeath;if (this.glitter) {star.sparkFreq = sparkFreq;star.sparkSpeed = sparkSpeed;star.sparkLife = sparkLife;star.sparkLifeVariation = sparkLifeVariation;star.sparkColor = this.glitterColor;star.sparkTimer = Math.random() * star.sparkFreq;}};if (typeof this.color === 'string') {if (this.color === 'random') {color = null; // falsey value creates random color in starFactory} else {color = this.color;}// Rings have positional randomness, but are rotated randomlyif (this.ring) {const ringStartAngle = Math.random() * Math.PI;const ringSquash = Math.pow(Math.random(), 0.45) * 0.992 + 0.008;createParticleArc(0, PI_2, this.starCount, 0, angle => {// Create a ring, squashed horizontallyconst initSpeedX = Math.sin(angle) * speed * ringSquash;const initSpeedY = Math.cos(angle) * speed;// Rotate ringconst newSpeed = MyMath.pointDist(0, 0, initSpeedX, initSpeedY);const newAngle = MyMath.pointAngle(0, 0, initSpeedX, initSpeedY) + ringStartAngle;const star = Star.add(x,y,color,newAngle,// apply near cubic falloff to speed (places more particles towards outside)newSpeed,//speed,// add minor variation to star lifethis.starLife + Math.random() * this.starLife * this.starLifeVariation);if (this.glitter) {star.sparkFreq = sparkFreq;star.sparkSpeed = sparkSpeed;star.sparkLife = sparkLife;star.sparkLifeVariation = sparkLifeVariation;star.sparkColor = this.glitterColor;star.sparkTimer = Math.random() * star.sparkFreq;}});}// "Normal burstelse {createParticleArc(0, PI_2, this.starCount, 1, starFactory);}}else if (Array.isArray(this.color)) {let start, start2, arc;if (Math.random() < 0.5) {start = Math.random() * Math.PI;start2 = start + Math.PI;arc = Math.PI;} else {start = 0;start2 = 0;arc = PI_2;}color = this.color[0];createParticleArc(start, arc, this.starCount / 2, 1, starFactory);color = this.color[1];createParticleArc(start2, arc, this.starCount / 2, 1, starFactory)}if (this.pistil) {const innerShell = new Shell({size: this.size * 0.5,starLife: this.starLife * 0.7,starLifeVariation: this.starLifeVariation,starDensity: 1.65,color: this.pistilColor,glitter: 'light',glitterColor: this.pistilColor === COLOR.Gold ? COLOR.Gold : COLOR.White});innerShell.burst(x, y);}if (this.streamers) {const innerShell = new Shell({size: this.size,starLife: this.starLife * 0.8,starLifeVariation: this.starLifeVariation,starCount: Math.max(6, this.size / 45) | 0,color: COLOR.White,glitter: 'streamer'});innerShell.burst(x, y);}// Queue burst flash renderBurstFlash.add(x, y, this.size / 8);}}const BurstFlash = {active: [],_pool: [],_new() {return {}},add(x, y, radius) {const instance = this._pool.pop() || this._new();instance.x = x;instance.y = y;instance.radius = radius;this.active.push(instance);return instance;},returnInstance(instance) {this._pool.push(instance);}};// Helper to generate objects for storing active particles.// Particles are stored in arrays keyed by color (code, not name) for improved rendering performance.function createParticleCollection() {const collection = {};COLOR_CODES_W_INVIS.forEach(color => {collection[color] = [];});return collection;}const Star = {// Visual propertiesdrawWidth: 3,airDrag: 0.98,airDragHeavy: 0.992,// Star particles will be keyed by coloractive: createParticleCollection(),_pool: [],_new() {return {};},add(x, y, color, angle, speed, life, speedOffX, speedOffY) {const instance = this._pool.pop() || this._new();instance.heavy = false;instance.x = x;instance.y = y;instance.prevX = x;instance.prevY = y;instance.color = color;instance.speedX = Math.sin(angle) * speed + (speedOffX || 0);instance.speedY = Math.cos(angle) * speed + (speedOffY || 0);instance.life = life;instance.spinAngle = Math.random() * PI_2;instance.spinSpeed = 0.8;instance.spinRadius = 0;instance.sparkFreq = 0; // ms between spark emissionsinstance.sparkSpeed = 1;instance.sparkTimer = 0;instance.sparkColor = color;instance.sparkLife = 750;instance.sparkLifeVariation = 0.25;this.active[color].push(instance);return instance;},// Public method for cleaning up and returning an instance back to the pool.returnInstance(instance) {// Call onDeath handler if available (and pass it current star instance)instance.onDeath && instance.onDeath(instance);// Clean upinstance.onDeath = null;// Add back to the pool.this._pool.push(instance);}};const Spark = {// Visual propertiesdrawWidth: 0.75,airDrag: 0.9,// Star particles will be keyed by coloractive: createParticleCollection(),_pool: [],_new() {return {};},add(x, y, color, angle, speed, life) {const instance = this._pool.pop() || this._new();instance.x = x;instance.y = y;instance.prevX = x;instance.prevY = y;instance.color = color;instance.speedX = Math.sin(angle) * speed;instance.speedY = Math.cos(angle) * speed;instance.life = life;this.active[color].push(instance);return instance;},// Public method for cleaning up and returning an instance back to the pool.returnInstance(instance) {// Add back to the pool.this._pool.push(instance);}};init();</script>
</body></html>

二、代码原理

这段代码的实现原理主要是通过 HTML、CSS 和外部资源（图标、字体和样式表）来构建一个具有烟花秀效果的网页。

首先，通过<meta>标签设置文档的元数据，如字符编码、视口大小等。然后，通过<link>标签引入外部资源，包括图标、字体和样式表。

在<style>标签中，定义了一系列的 CSS 样式规则。这些样式规则用于设置页面元素的位置、尺寸、颜色、字体等样式属性。例如，设置容器的高度为100%，设置背景颜色为黑色，设置文字的颜色和字体等。

在样式规则中，使用了类选择器（以.开头）和id选择器（以#开头）来选择特定的元素，并对它们应用相应的样式。例如，通过.container选择器选择了类名为.container的元素，并设置其为居中对齐。

此外，还使用了媒体查询（@media）来根据不同的屏幕宽度设置不同的样式。例如，在宽度大于800px时，显示菜单栏并设置透明度为1；在小于800px时，隐藏菜单栏。

整个页面的布局和样式通过HTML和CSS实现，通过引入外部资源来美化页面。最终效果是一个具有烟花秀效果的网页，用户可以在此网页上观看跨年烟花秀。

鉴于该代码较长，此处只对一小部分核心代码进行解释说明，具体如下所示：

<!DOCTYPE html>：声明文档类型为 HTML。
<html lang="en">：开始 HTML 标签，并指定页面语言为英语。
<head>：头部标签，包含了关于文档的元数据。
<meta charset="UTF-8">：设置字符编码为 UTF-8。
<title>跨年烟花秀</title>：设置页面标题为“跨年烟花秀”。
一系列 <meta> 标签：设置视口、苹果设备支持、主题色等元信息。
一系列 <link> 标签：引入图标、字体和样式表等外部资源。
<style>：内部样式表，定义页面元素的样式。
CSS样式规则：包括元素的位置、尺寸、颜色、字体等样式设置。
* {...}：通配符样式，设置所有元素的默认样式。
.container {...}：定义类名为.container的容器样式。
#loading-init {...}：定义id为loading-init的元素样式。
#stage-container {...}：定义id为stage-container的元素样式。
#canvas-container {...}：定义id为canvas-container的元素样式。
#controls {...}：定义id为controls的元素样式。
媒体查询 @media (min-width: 800px)：针对不同屏幕宽度设置不同的样式。
#menu {...}：定义id为menu的元素样式。
#menu__header {...}：定义id为menu__header的元素样式。
#menu form {...}：定义form元素的样式。
#menu .form-option {...}：定义类名为.form-option的表单选项样式。
#menu .form-option label {...}：定义表单选项中的标签样式。
#menu .form-option--select {...}：定义下拉选择框的样式。
#menu .form-option--checkbox {...}：定义复选框的样式。
媒体查询 @media (max-width: 800px)：针对小屏幕设备设置不同的样式。
#close-menu-btn {...}：定义关闭菜单按钮样式。
.btn {...}：定义按钮样式。
.btn svg {...}：定义按钮内的 SVG 图标样式。

用HTML和CSS打造跨年烟花秀视觉盛宴

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