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();
  }