问题描述

js中回调函数问题，程序进不了回调函数

我这段代码的回调函数哪出错，请各位大神指教

function req(){
createRequest();

var zipcode=document.getElementById(""zipcode"").value;

var url=""b.jsp?zipcode="" + escape(zipcode);
request.open(""POST""urltrue);
request.onreadystatechage=updatePage;
request.send(null);
}

    function updatePage(){              if(request.readyState==4){            alert(""readyState is done"");            if(request.status==200){                //alert(""service is done"");                var response=request.responseText.split("");                document.getElementById(""city"").value=response[0];                document.getElementById(""province"").value=response[1];            }        }    }