var xmlWrap = [];
    var url="http://www.webxml.com.cn/WebServices/WeatherWebService.asmx";
    var listName="WeatherWebService";
     
    xmlWrap.push("<?xml version='1.0' encoding='utf-8'?>");
    xmlWrap.push("<soap:Envelope xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xsd='http://www.w3.org/2001/XMLSchema' xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/'>");
    xmlWrap.push("<soap:Body>");
    xmlWrap.push('<getWeatherbyCityName xmlns="http://WebXml.com.cn/">');
    xmlWrap.push('<theCityName>'+cityname+'</theCityName>');
    xmlWrap.push("</getWeatherbyCityName>");
    xmlWrap.push("</soap:Body>");
    xmlWrap.push("</soap:Envelope>");
    xmlWrap = xmlWrap.join('');
    
    $.ajax({
        async:false,
        type:"POST",
        url:"http://www.webxml.com.cn/WebServices/WeatherWebService.asmx",
        contentType:"text/xml; charset=utf-8",
        processData:false,
        data:xmlWrap,
        dataType:"xml",
        error:function (result) { //succes
          alert("失败"+result.d); 
                    } 
        success:function(data){
          alert("成功"); 
          //TODO
                    } 
                     
    });