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function callback(){
  if (req.readyState == 4){
  if(req.status == 200){
  var msg = req.responseXML.getElementsByTagName("msg")[0];
  // alert(msg.childNodes[0].nodeValue);
  setMsg(msg.childNodes[0].nodeValue);
  }
  }
}
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function handleResponse(){  
  if(xmlHttpReq.readyState==4&&xmlHttpReq.status==200){
   
  var text=xmlHttpReq.responseXML;
  var citys = text.getElementsByTagName("city"); 
  alert(citys);
  var citySelect = docum