JS怎么做出雪花飘落动画

nbsp;html>


  <meta>
  <meta>
  <title> JS下雪动画</title>
  <meta>
  <meta><style>
  .masthead {
    background-color:#333;
    display:block;
    width:100%;
    height:400px;
  }
</style><p></p>
<script>
  (function () {
    var COUNT = 300;
    var masthead = document.querySelector(&#39;.masthead&#39;);
    var canvas = document.createElement(&#39;canvas&#39;);
    var ctx = canvas.getContext(&#39;2d&#39;);
    var width = masthead.clientWidth;
    var height = masthead.clientHeight;
    var i = 0;
    var active = false;
    function onResize() {
      width = masthead.clientWidth;
      height = masthead.clientHeight;
      canvas.width = width;
      canvas.height = height;
      ctx.fillStyle = &#39;#FFF&#39;;
      var wasActive = active;
      active = width > 600;
      if (!wasActive && active)
        requestAnimFrame(update);
    }
    var Snowflake = function () {
      this.x = 0;
      this.y = 0;
      this.vy = 0;
      this.vx = 0;
      this.r = 0;
      this.reset();
    };
    Snowflake.prototype.reset = function() {
      this.x = Math.random() * width;
      this.y = Math.random() * -height;
      this.vy = 1 + Math.random() * 3;
      this.vx = 0.5 - Math.random();
      this.r = 1 + Math.random() * 2;
      this.o = 0.5 + Math.random() * 0.5;
    };
    canvas.style.position = &#39;absolute&#39;;
    canvas.style.left = canvas.style.top = &#39;0&#39;;
    var snowflakes = [], snowflake;
    for (i = 0; i < COUNT; i++) {
      snowflake = new Snowflake();
      snowflakes.push(snowflake);
    }
    function update() {
      ctx.clearRect(0, 0, width, height);
      if (!active)
        return;
      for (i = 0; i < COUNT; i++) {
        snowflake = snowflakes[i];
        snowflake.y += snowflake.vy;
        snowflake.x += snowflake.vx;
        ctx.globalAlpha = snowflake.o;
        ctx.beginPath();
        ctx.arc(snowflake.x, snowflake.y, snowflake.r, 0, Math.PI * 2, false);
        ctx.closePath();
        ctx.fill();
        if (snowflake.y > height) {
          snowflake.reset();
        }
      }
      requestAnimFrame(update);
    }
    // shim layer with setTimeout fallback
    window.requestAnimFrame = (function(){
      return window.requestAnimationFrame    ||
          window.webkitRequestAnimationFrame ||
          window.mozRequestAnimationFrame  ||
          function( callback ){
            window.setTimeout(callback, 1000 / 60);
          };
    })();
    onResize();
    window.addEventListener(&#39;resize&#39;, onResize, false);
    masthead.appendChild(canvas);
  })();
</script>