google.maps.event.addListener(marker, 'dragend', (function(marker, f) {//这里
                    return  function()//这里
                    {
                    
                    })(marker, f));//这里

这三个点

跟这个的区别

google.maps.event.addListener(marker, 'dragend', function(marker, f) {//这里
          
});

google.maps.event.addListener(marker, 'dragend', (function(marker, f) {
                        return  function()
                        {
                               if(confirm("Are you sure you want to change lat/lng?")){   
                            var park_id = ID[f];
                            var lat = this.getPosition().lat();
                            var lng = this.getPosition().lng();
                                    $.ajax({
                              type: "POST",
                              url: "<?php echo base_url() ?>Admin/updateParkid", 
                              data: {park_id: park_id, latitude: lat, longitude: lng},
                              dataType: '',
                              success: function(result){
                                alert(result);

                                //marker.setIcon(iconBase);
                                        }
                              });            
                            } }
                         })(marker, f));