js压缩

Question

X2JSCompactor.rar
packer2.net
JsPacker.exe
对JS进行了压缩,结果前两者压缩后出代码出错,最后一个压缩失败,有一个成功的也是压后JS出错,看来当前的JS压缩工具不是很理想.function createXmlHttp()
{
var xmlhttp_request = false;    
try{        
if( window.ActiveXObject )
{            
    for( var i = 5; i; i-- )
    {               
    try
    {                   
    if( i == 2 )
    {
                    xmlhttp_request = new ActiveXObject( "Microsoft.XMLHTTP" );                       
    }
    else
    {
                    xmlhttp_request = new ActiveXObject( "Msxml2.XMLHTTP." + i + ".0" );
    xmlhttp_request.setRequestHeader("Content-Type","text/xml");
    xmlhttp_request.setRequestHeader("Content-Type","gb2312");
    //xmlhttp_request.setRequestHeader("charset","gb2312");               
    }
    break;
    }               
    catch(e)
    {   
    xmlhttp_request = false;              
    }          
    }      
}
else if( window.XMLHttpRequest )
{            
xmlhttp_request = new XMLHttpRequest();              
}   
}
catch(e)
{        
xmlhttp_request = false;   
}    
return xmlhttp_request ;
}function GetAjaxText(urlHtml)
{
     var NewXml=createXmlHttp();
     if(NewXml!=null)
     {
        NewXml.open("POST",urlHtml,false);
        NewXml.send();     //  alert(NewXml.responseText);
        return unescape(NewXml.responseText);
    }
}
function ExecutAjax(urlHtml)
{
    var NewXml=createXmlHttp();
    NewXml.open("POST",urlHtml,true);
    NewXml.send();
}
对以上代码最后一个就失败...