openlayer简单例子

var vectorLayer = new OpenLayers.Layer.Vector("points");map.addLayer(vectorLayer);var markers = new OpenLayers.Layer.Markers( "Markers" );var imageUrl = 'http://www.openlayers.org/dev/img/marker.png';var jz = new OpenLayers.Icon(imageUrl,size,offset);var size = new OpenLayers.Size(21,25);var offset = new OpenLayers.Pixel(-(size.w/2), -size.h);for(var i=0;i<datas.length;i++) {var point = new OpenLayers.Geometry.Point(Number(datas[i].lon), Number(datas[i].lat));//图片样式/*var style_point = { graphicWidth : 21, graphicHeight: 25, externalGraphic:imageUrl, graphicTitle:datas[i].value};*///标注样式var style_point = {                 strokeColor: '#000000',                 strokeWidth: 1,                 strokeDashstyle: "solid",                 pointRadius: 1,                 strokeOpacity: 0.8,                 fillOpacity: 0.8,                 label:datas[i].value,                 fontSize:'12px',                 fontFamily:'宋体',                 labelXOffset:0,                 labelYOffset:-15,                 labelAlign:'m',                 //fillColor: '#000000'};var pointFeature = new OpenLayers.Feature.Vector(point, null, style_point);vectorLayer.addFeatures([pointFeature]);//图片显示var marker = new OpenLayers.Marker(new OpenLayers.LonLat(datas[i].lon,datas[i].lat),jz.clone());markers.addMarker(marker);map.addLayer(markers);createPopup(marker, datas[i]);}//鼠标移开事件/*marker.events.register("mouseout", marker, function(evt){popup1.hide();});*/if(!map.getCenter()){map.zoomToMaxExtent();}}//弹窗function createPopup(marker, data) {//鼠标悬浮到图标上的事件 marker.events.register("click", marker, function(evt){ var html="<b>  "+data.level+"<br>  当前值："+data.value+"人</b>"; var popup1=new OpenLayers.Popup("popup1",new OpenLayers.LonLat(data.lon,data.lat),new OpenLayers.Size(200,50),html,true); popup1.setBackgroundColor("#ffffff"); popup1.setOpacity(12); popup1.setBorder("1px solid #d91f12"); map.addPopup(popup1);});}