AJAX初级聊天室代码

TP");
                }catch(e){
                    try{
                        xmldoc = new ActiveXObject("Microsoft.XMLHTTP");
                    }catch(e){}
                }
            }
        }
    }
    if(!xmldoc){
        return false;
    }
}
function createQueryString(names){
    var conts = getName(names).value
    if(conts != ""){
        if(conts == "clear"){
            getId("chatmain").innerHTML = ""
            clean()
            focs()
            return false
        }else{
            return conts
        }
    }else{
        return false
    }
}
function doUsingGet(){
    xmldoc = false
    createxmldoc()
    var url = "chat.asp?clien="+nowNum+"&timeStamp="+new Date().getTime();
    xmldoc.open("GET",url,true);
    xmldoc.onreadystatechange = CheckState;
    xmldoc.setRequestHeader("Content-Type","text/xml;charset=GB2312;");
    xmldoc.send(null);
}
function doUsingPost(){
    createxmldoc()
    if(createQueryString("inputs")){
        if(createQueryString("named")){
            var named = "&named="+createQueryString("named")
        }else{
            var named = ""    
        }
        if(createQueryString("inputs") == "cls"){
            nowNum = "m"
        }