啥都不说，先上效果图，同志们觉得满意就继续看，不中意直接过。

效果为满屏幕的红心到处乱窜，红心自动变换大小和透明度，代码也不多，同志们直接复制就可以运行查看。

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>满屏幕红心</title>
    <style type="text/css">
      body{
        margin: 0;
        overflow: hidden;
        background: #303035;
      }
    </style>
  </head>
  <body>
    <canvas></canvas>
    <div id="container" class="container"></div>

    <script src="https://code.jquery/jquery-3.2.1.min.js" charset="utf-8"></script>
    <script type="text/javascript">
      var canvas = document.querySelector("canvas");
      var ctx = canvas.getContext("2d");

      var ww = window.innerWidth;
      var wh = window.innerHeight;

      var hearts = [];

      function init(){
        requestAnimationFrame(render);
        canvas.width = ww;
        canvas.height = wh;
        for(var i = 0; i < 100; i++){
          hearts.push(new Heart());
        }
      }

      function Heart() {
        this.x = Math.random() * ww;
        this.y = Math.random() * wh;
        this.opacity = (Math.random() * 0.5) + 0.5;
        this.vel = {
          x: (Math.random() - 0.5) * 4,
          y: (Math.random() - 0.5) * 4
        };
        this.targetScale = (Math.random() * 0.15) + 0.02;
        this.scale = this.targetScale * Math.random();
      }

      Heart.prototype.update = function(){
        this.x += this.vel.x;
        this.y += this.vel.y;

        this.scale += (this.targetScale - this.scale) * 0.01;
        if(this.x - this.width > ww || this.x + this.width < 0){
          this.scale = 0;
          this.x = Math.random() * ww;
        }
        if(this.y - this.height > wh || this.y + this.height < 0){
          this.scale = 0;
          this.y = Math.random() * wh;
        }
        this.width = 473.8 * this.scale;
        this.height = 408.6 * this.scale;
      }
      Heart.prototype.draw = function(){
        ctx.globalAlpha = this.opacity;
        ctx.drawImage(heartImage, this.x - this.width * 0.5, this.y - this.height * 0.5,this.width, this.height);
      }

      function render(){
        ctx.clearRect(0, 0, ww, wh);
        // ctx.globalAlpha = 1;
        // ctx.fillStyle = "rgba(255,255,255,0.3)";
        // ctx.fillRect(0, 0, ww, wh);
        for(var i=0; i<100; i++){
          hearts[i].update();
          hearts[i].draw();
        }
        requestAnimationFrame(render);
      }

      var heartImage = new Image();
      heartImage.onload = init();
      heartImage.src =  "data:image/svg+xml;base64,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";

      window.addEventListener("resize",function(){
        ww = window.innerWidth;
        wh = window.innerHeight;
      })

    </script>
  </body>
</html>

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