重新window.onerror方法就行了
window.onerror = handleError
function handleError(msg,url,l)
{
var txt="There was an error on this page.\n\n"
txt+="Error: " + msg + "\n"
txt+="URL: " + url + "\n"
txt+="Line: " + l + "\n\n"
txt+="Click OK to continue.\n\n"
alert(txt)
return true
} //如果返回值为 false，则在控制台 (JavaScript console) 中显示错误消息。反之则不会