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html在圖片上實現下雨效果，
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>
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