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html在图片上实现下雨效果

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2 <html> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5 <style media="screen"> 6 body { 7     overflow: hidden; 8     height: 100%; 9     margin: 0;10     padding: 0;11 }12 13 img {14     width: 100%;15     height: 100%;16 }17 </style>18 <script src="http://maroslaw.github.io/rainyday.js/dist/rainyday.0.1.2.min.js" type="text/javascript"></script>19 <script type="text/javascript">20     function run() {21         var image = document.getElementById(background);22         image.onload = function() {23             var engine = new RainyDay({24                 image : this,25             });26             engine.rain([ [ 1, 2, 8000 ] ]);27             engine.rain([ [ 3, 3, 0.88 ], [ 5, 5, 0.9 ], [ 6, 2, 1 ] ], 100);28         }29         image.crossOrigin = anonymous;30         image.src = http://i.imgur.com/N7ETzFO.jpg;31     }32 </script>33 <title>哇塞!</title>34 </head>35 <body onLoad="run();">36     <img id="background" alt="background" src="" />37 </body>38 </html>

 

html在图片上实现下雨效果