html
<!doctype html> <html> <head> <meta charset="utf-8"> <title></title> <script type="text/javascript" src="23.js"></script> </head> <body onBlur="draw(‘canvas‘);"> <canvas id="canvas" width="500" height="350"></canvas> </body> </html>
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js
// JavaScript Document
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效果图：
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原文：http://onestopweb.iteye.com/blog/2260597