Baidu Musicbox 用到的ajax代码

;  case "att":
                attach=ct;
                break;
            }
        }
    }
    if(!isCache){
        var t=new Date().getTime();
        if(url.indexOf("?")>0){
        url+="&t="+t;
        }else{
            url+="?t="+t;
        }
    }    
    var postdata=null;
    if(method=="POST"){
        purl=url.split("?");
        url=purl[0];
        postdata=purl;
    }
    RequestHTTP(url,handleResponse,method,isXML,postdata,attach);
}

function RequestHTTP(burl,rdRandleResponse,bmethod,bXML,Formdata,attach){
    var http_request = false;
    function doHttpRequest(){    
        if (window.XMLHttpRequest){
            http_request = new XMLHttpRequest();
            if (http_request.overrideMimeType){
                http_request.overrideMimeType(''text/xml'');
            }
        } else if (window.ActiveXObject){
            try{
                http_request = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (e){
                try{
                    http_request = new ActiveXObject("Microsoft.XMLHTTP");
                } catch (e){}
            }