js调试
1、使用window.onerror方法，类似如下代码：<div style="padding-right: 5px; padding-left: 4px; font-size: 13px; padding-bottom: 4px; border-left-color: #cccccc; width: 98%; padding-top: 4px; background-color: #eeeeee;">http://www.blogjava.net/Images/OutliningIndicators/None.gif<script language="javascript">
http://www.blogjava.net/Images/OutliningIndicators/ExpandedBlockStart.gifhttp://www.blogjava.net/Images/OutliningIndicators/ContractedBlock.gif function fnErrorTrap(sMsg,sUrl,sLine)http://www.blogjava.net/Images/dot.gif{
http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif alert("Error: " + sMsg + "<br>");
http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif alert("Line: " + sLine + "<br>");
http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif alert("URL: " + sUrl + "<br>");
http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif return false;
http://www.blogjava.net/Images/OutliningIndicators/ExpandedBlockEnd.gif }
http://www.blogjava.net/Images/OutliningIndicators/None.gif
http://www.blogjava.net/Images/OutliningIndicators/None.gif window.onerror=fnErrorTrap;
http://www.blogjava.net/Images/OutliningIndicators/None.gif</script>
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