获取JS异常信息（文件名，行数）
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN""http://www.w3.org/TR/html4/strict.dtd"><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>A</title><meta name="generator" content="Studio 3 http://aptana.com/"><meta name="author" content="Administrator"><!-- Date: 2011-08-07 --><script type="text/javascript" language="JavaScript">window.onerror = function(meg,url,link) {alert("message:"+meg+";url:"+url+";link:"+link); };throw new Error("自定义异常");</script></head><body></body></html>?