方式一：使用marker方式
1、在地图上添加标记图层
var markers =newOpenLayers.Layer.Markers("Markers"); map.addLayer(markers);//地图初始化添加
2、动态添加标记和Popup方法：
//add map initial method map.events.register('click', this, function(e) {var LonLat=new OpenLayers.getLonLatFromPixel(e.xy);autoAddMarker(LontLat);OpenLayers.Event.stop(e); });//others methodfunction getIcon(){var size =newOpenLayers.Size(21,25);var offset =newOpenLayers.Pixel(-(size.w/2),-size.h);var icon =newOpenLayers.Icon('http://www.openlayers.org/dev/img/marker.png', size, offset);return icon;}function createPopup(marker,LonLat){var size=new OpenLayers.Size(200,120);var html="Lon:"+LonLat.Lon+"</br>Lat:"+LonLat.Lat;var popup=new OpenLayers.Popup(marker,LonLat,size,html,true);}function autoAddMarker(LontLat){var marker=newOpenLayers.Marker(LonLat,getIcon);var popup=createPopup(marker,LonLat);marker.events.register('click',this,function(){map.addPopup(popup,true);popup.show();});markers.addMarker(marker);}
3、事件触发，点击地图获得marker 及其信息窗口。
如果click不是OpenLayers.Events的register方法，就需要activate Click方法。
方式二：使用feature本身提供的特性
//显示矢量信息'pointVectorLayer':new OpenLayers.Layer.Vector("加点图层", {eventListeners:{'featureselected':function(evt){var feature = evt.feature;if(myPopup) this.map.removePopup(myPopup);myPopup=createPopup(feature.point);feature.popup = myPopup;this.map.addPopup(myPopup);},'featureunselected':function(evt){var feature = evt.feature;this.map.removePopup(feature.popup);feature.popup.destroy();feature.popup = null;}}}),
直接注册矢量层的事件，推荐使用第二种方式，它可以与整体弹出框的样式保持一致，都是popup类型的。
