雨滴特效想必大家都有见到过吧，而本文所要介绍的这个特效是借助HTML5实现的，晶莹剔透，感兴趣的朋友可以尝试运行下
<html>
<head>
<title>HTML5雨滴特效</title>
<style media="screen" type="text/css">
img { display: none; }
body { overflow: hidden; }
#canvas { position: absolute; top: 0px; left: 0px; }
</style>
<script src="/jscss/demoimg/201401/rainyday.js" type="text/javascript"></script>
<script type="text/javascript">
function demo() {
var engine = new RainyDay('canvas','demo1', window.innerWidth, window.innerHeight);
engine.gravity = engine.GRAVITY_NON_LINEAR;
engine.trail = engine.TRAIL_DROPS;
engine.rain([
engine.preset(0, 2, 500)
]);
engine.rain([
engine.preset(3, 3, 0.88),
engine.preset(5, 5, 0.9),
engine.preset(6, 2, 1),
], 100);
}
</script>
</head>
<body onload="demo();">
<img id="demo1" src="/jscss/demoimg/201401/8390.jpg" />
<div id="cholder">
<canvas id="canvas"></canvas>
</div>
</body>
</html> 
