Question

while running these functions, I am calling such web service through which I have to generate session Id. consider url is correct
I want to know,that I am calling function from onreadystatechange.wheteher it is correct way. if you have another way please reply.

职能:

    var xmlhttpRequest = null;
    xmlhttpRequest = new XMLHttpRequest();
    xmlhttpRequest.open("GET", _url, true);
    xmlhttpRequest.send();

    xmlhttpRequest.onreadystatechange = function() {
        //alert(xmlhttpRequest.status);
        if(xmlhttpRequest.readyState == 4)// 4: The Request is complete
        {

            var request = xmlhttpRequest.responseXML;
            var items = request.getElementsByTagName("id")[0].firstChild.nodeValue;

            var hashcode = GetHashCode(passwordvalue + items);
            var strUrl = commonURL +  data/  + userName +  ;  + hashcode;
            data1(strUrl,  tagname );//calling another function to generate session id
        }
    }

}


function data1(_url, _tagName) 
{
    var xmlhttpRequest = null;
    xmlhttpRequest = new XMLHttpRequest();
    xmlhttpRequest.open("GET", _url, true);
    xmlhttpRequest.send();
    xmlhttpRequest.onreadystatechange = function()
    {
        if(xmlhttpRequest.readyState == 4 && xmlhttpRequest.status==200)// 4: The Request is complete
        {

            var request = xmlhttpRequest.responseXML;
            //alert( items .....=  + request);
            var sessionid = request.getElementsByTagName(_tagName)[0].firstChild.nodeValue;
            alert( session ID= +sessionid); 

        }
    }
}

感谢

Answer 1

i) 将<条码>xmlhttp://request.send(>);置于地势变化功能之后

同样,当你使用GET方法时,你会发出一个无效价值,即零。

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