昨天晚上，小编的朋友在聊天的时候谈到了这个：

小编一时间觉得好像与世界脱轨，百度找了一下，终于知道了，原来是最近很火的电视剧《点燃我，温暖你》的一幕：

 朱韵看见了李珣写的代码竟然如此简单，不得不佩服李珣的能力。回去后，朱韵还是想解开李珣的代码，但是尝试了很久竟然打开了，结果一看竟然是一颗跳动的爱心，没想到李珣做的代码竟然比任何人都做的更好。朱韵也不得不佩服李珣的实力，其实当时朱韵U盘上的病毒也是李珣解开的，高见鸿也是听吴孟兴说的，高见鸿倒是觉得可以将兴趣小组解散了，朱韵也只好答应了。
                                                                                                                                         ——本处内容来自搜视网的剧情介绍

好嘛，真会玩，让我们来看看大概长啥样：

我们安排一下！

技术实现

我们使用HTML的canvas进行图案的绘制，这样绘制出来的图案手机电脑都能看！

一般来说html，css，JavaScript要分开写，因为我们的代码量比较少，我们直接写在一起，以下就是具体的代码实现：

爱心.html

<html lang="">
  <head>
    <meta charset="utf-8" />
    <title>爱心代码</title>
    <style>
      html, body {
        height: 100%;
        padding: 0;
        margin: 0;
        background: #000;
      }
      canvas {
        position: absolute;
        width: 100%;
        height: 100%;
      }
    </style>
  </head>
  <body>
    <canvas id="pinkboard" width="1873" height="218"></canvas>
    <script> var settings = { particles: { length: 500, duration: 2, velocity: 100, effect: -0.75, size: 32, }, }; (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) { // create and populate particle pool 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); // handle circular queue firstFree++; if (firstFree == particles.length) firstFree = 0; if (firstActive == firstFree) firstActive++; if (firstActive == particles.length) firstActive = 0; }; ParticlePool.prototype.update = function (deltaTime) { var i; // update active particles 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); } // 移除非活性粒子 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; // helper函数创建路径 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; point = to(t); context.lineTo(point.x, point.y); } context.closePath(); // 创建填充 context.fillStyle = "#ea80b0"; context.fill(); // 创建图像 var image = new Image(); image.src = canvas.toDataURL(); return image; })(); // 渲染 function render() { // 下一动画帧 requestAnimationFrame(render); var newTime = new Date().getTime() / 1000, deltaTime = newTime - (time || newTime); time = newTime; // 清除画布 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）画布的大小 function onResize() { canvas.width = canvas.clientWidth; canvas.height = canvas.clientHeight; } window.onresize = onResize; //延迟渲染 setTimeout(function () { onResize(); render(); }, 10); })(document.getElementById("pinkboard")); </script>
  </body>
</html>

运行结果如下：

canvas是前端最强大的绘制工具，我们可以拿他来作图，也可以拿来做游戏，更多canvas的相关学习内容可以前往Canvas入门到项目实战学习！

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