编写JavaScript中公用的onerror事件

JavaScript中我们可以定义一个通用的错误处理程序，只要页面出现JS错误就自动调用已经定义好的错误处理程序

onerror=handleErr;
var txt="";

function handleErr(msg,url,l)
{
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;
}

function message()
{
adddlert("Welcome guest - 75271.com");
}