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html中的爱心小特效。
hello，分享一个好玩的，我想大家大家有时候也是比较累吧，最近这个特效也是很火，我就拔来了一下源码，这里和大家看一下，
【爱心代码｜源码在视频简介｜这次一定！】 https://www.bilibili.com/video/BV1Ye411F7EZ/?share_source=copy_web&vd_source=385ba0043075be7c24c4aeb4aaa73352
爱心代码｜源码在视频简介｜这次一定！
代码在这里：
<html> <head> <meta charset="utf-8"> <title>loveHearttitle> <link rel="shortcut icon" href="http://zhouql.vip/images/心.png" type="image/x-icon"> <style> html, body { height: 100%; padding: 0; margin: 0; background: #000; } canvas { position: absolute; width: 100%; height: 100%; } p{ position: fixed; top: 50%; left: 50%; transform: translate(-50%,-50%); color: pink; animation: k 1.5s ease-in-out infinite; } @keyframes k{ 100%{ font-size: 24px; opacity: 0; } } style> head> <body> <p>致我最爱的夏子恬小朋友p> <canvas id="pinkboard">canvas> <script> var settings = { particles: { length: 600, // 爱心的大小 duration: 2, // 爱心扩散速度，越小速度越快 velocity: 100, // 爱心扩散速度，越小速度越慢 effect: -0.75, // 爱心收缩效果，比如：1扩散，-2收缩 size: 26, // 爱心数量 }, }; (function () { var b = 0; var c = ["ms", "moz", "webkit", "o"]; for (var a = 0; a < c.length && !window.requestAnimationFrame; ++a) { window.requestAnimationFrame = window[c[a] + "RequestAnimationFrame"]; window.cancelAnimationFrame = window[c[a] + "CancelAnimationFrame"] || window[c[a] + "CancelRequestAnimationFrame"] } if (!window.requestAnimationFrame) { window.requestAnimationFrame = function (h, e) { var d = new Date().getTime(); var f = Math.max(0, 16 - (d - b)); var g = window.setTimeout(function () { h(d + f) }, f); b = d + f; return g } } if (!window.cancelAnimationFrame) { window.cancelAnimationFrame = function (d) { clearTimeout(d) } } }()); var Point = (function () { function Point(x, y) { this.x = (typeof x !== 'undefined') ? x : 0; this.y = (typeof y !== 'undefined') ? y : 0; } Point.prototype.clone = function () { return new Point(this.x, this.y); }; Point.prototype.length = function (length) { if (typeof length == 'undefined') return Math.sqrt(this.x * this.x + this.y * this.y); this.normalize(); this.x *= length; this.y *= length; return this; }; Point.prototype.normalize = function () { var length = this.length(); this.x /= length; this.y /= length; return this; }; return Point; })(); var Particle = (function () { function Particle() { this.position = new Point(); this.velocity = new Point(); this.acceleration = new Point(); this.age = 0; } Particle.prototype.initialize = function (x, y, dx, dy) { this.position.x = x; this.position.y = y; this.velocity.x = dx; this.velocity.y = dy; this.acceleration.x = dx * settings.particles.effect; this.acceleration.y = dy * settings.particles.effect; this.age = 0; }; Particle.prototype.update = function (deltaTime) { this.position.x += this.velocity.x * deltaTime; this.position.y += this.velocity.y * deltaTime; this.velocity.x += this.acceleration.x * deltaTime; this.velocity.y += this.acceleration.y * deltaTime; this.age += deltaTime; }; Particle.prototype.draw = function (context, image) { function ease(t) { return (--t) * t * t + 1; } var size = image.width * ease(this.age / settings.particles.duration); context.globalAlpha = 1 - this.age / settings.particles.duration; context.drawImage(image, this.position.x - size / 2, this.position.y - size / 2, size, size); }; return Particle; })(); var ParticlePool = (function () { var particles, firstActive = 0, firstFree = 0, duration = settings.particles.duration; function ParticlePool(length) { // 创建并填充粒子池 particles = new Array(length); for (var i = 0; i < particles.length; i++) particles[i] = new Particle(); } ParticlePool.prototype.add = function (x, y, dx, dy) { particles[firstFree].initialize(x, y, dx, dy); // 处理循环队列 firstFree++; if (firstFree == particles.length) firstFree = 0; if (firstActive == firstFree) firstActive++; if (firstActive == particles.length) firstActive = 0; }; ParticlePool.prototype.update = function (deltaTime) { var i; // 更新活性粒子 if (firstActive < firstFree) { for (i = firstActive; i < firstFree; i++) particles[i].update(deltaTime); } if (firstFree < firstActive) { for (i = firstActive; i < particles.length; i++) particles[i].update(deltaTime); for (i = 0; i < firstFree; i++) particles[i].update(deltaTime); } // 去除非活性颗粒 while (particles[firstActive].age >= duration && firstActive != firstFree) { firstActive++; if (firstActive == particles.length) firstActive = 0; } }; ParticlePool.prototype.draw = function (context, image) { // 绘制活性粒子 if (firstActive < firstFree) { for (i = firstActive; i < firstFree; i++) particles[i].draw(context, image); } if (firstFree < firstActive) { for (i = firstActive; i < particles.length; i++) particles[i].draw(context, image); for (i = 0; i < firstFree; i++) particles[i].draw(context, image); } }; return ParticlePool; })(); (function (canvas) { var context = canvas.getContext('2d'), particles = new ParticlePool(settings.particles.length), particleRate = settings.particles.length / settings.particles.duration, // particles/sec time; // 用 -PI <= t <= PI 获得心脏点 function pointOnHeart(t) { return new Point( 160 * Math.pow(Math.sin(t), 3), 130 * Math.cos(t) - 50 * Math.cos(2 * t) - 20 * Math.cos(3 * t) - 10 * Math.cos(4 * t) + 25 ); } // 使用虚拟画布创建粒子图像 var image = (function () { var canvas = document.createElement('canvas'), context = canvas.getContext('2d'); canvas.width = settings.particles.size; canvas.height = settings.particles.size; //用于创建路径的帮助程序函数 function to(t) { var point = pointOnHeart(t); point.x = settings.particles.size / 2 + point.x * settings.particles.size / 350; point.y = settings.particles.size / 2 - point.y * settings.particles.size / 350; return point; } // 创建路径 context.beginPath(); var t = -Math.PI; var point = to(t); context.moveTo(point.x, point.y); while (t < Math.PI) { t += 0.01; // baby steps! point = to(t); context.lineTo(point.x, point.y); } context.closePath(); // 创建填充 context.fillStyle = '#ea80b0'; context.fill(); // 创建映像 var image = new Image(); image.src = canvas.toDataURL(); return image; })(); // 渲染那个东西！ function render() { // 下一个动画帧 requestAnimationFrame(render); // 更新时间 var newTime = new Date().getTime() / 1000, deltaTime = newTime - (time || newTime); time = newTime; // 透明画布，清楚画布 context.clearRect(0, 0, canvas.width, canvas.height); // 创建新粒子 var amount = particleRate * deltaTime; for (var i = 0; i < amount; i++) { var pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random()); var dir = pos.clone().length(settings.particles.velocity); particles.add(canvas.width / 2 + pos.x, canvas.height / 2 - pos.y, dir.x, -dir.y); } //更新和绘制粒子 particles.update(deltaTime); particles.draw(context, image); } // 处理（重新）调整画布的大小 function onResize() { canvas.width = canvas.clientWidth; canvas.height = canvas.clientHeight; } window.onresize = onResize; // 延迟渲染引导 setTimeout(function () { onResize(); render(); }, 10); })(document.getElementById('pinkboard')); script> body> html>- 1
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，人家写的就是不一样，这个Javascrip,还是要学好Javascrip，不然难办，这里的代码看起来都是迷迷糊糊的。
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- 原文地址：https://blog.csdn.net/muweichang/article/details/127766971
