google map api 动态反向地址解析,该怎么处理

function getPOI()  {     address1 = document.getElementById("address1").value;     geocoder.geocode({'address': address1}, function(results, status) {       if (status == google.maps.GeocoderStatus.OK) {               mylatlng=results[0].geometry.location;       getAddress();//根据坐标得到详细地址       }     });   }    function getAddress() {    geocoder.geocode({'latLng': mylatlng}, function(results, status) {      if (status == google.maps.GeocoderStatus.OK) {        if (results[1]) {          map.setZoom(11);          var myOptions=          {            zoom:11,            center:mylatlng,            mapTypeId:google.maps.MapTypeId.ROADMAP          }          map = new google.maps.Map(document.getElementById("myMap"), myOptions);          infocontent=results[0].formatted_address;          marker = new google.maps.Marker({              position: mylatlng,              map: map,              draggable:true          });          infowindow.setContent(results[1].formatted_address);          infowindow.open(map, marker);          movemarker();        }      } else {        alert("Geocoder failed due to: " + status);      }    });  }    //移动图标的事件，需要增加addlistener  function movemarker()  {        google.maps.event.addListener(marker,'dragend',function(event)        {            newposition();//获取新坐标        });        infowindow.setContent(infocontent);        infowindow.open(map,marker);     }    //处理新坐标，并重新进行反向地址解析  function newposition()  {        var mylatlng=marker.getPosition();        getAddress();  }