openlayers 各种图层，持续更新

   /*高德地图*/
     var vectorLayerLine = new ol.layer.Tile({

           source: new ol.source.XYZ({
             urls: [
                   "http://webrd01.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scale=1&style=7&x={x}&y={y}&z={z}",
                   "http://webrd02.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scale=1&style=7&x={x}&y={y}&z={z}",
                   "http://webrd03.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scale=1&style=7&x={x}&y={y}&z={z}",
                   "http://webrd04.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scale=1&style=7&x={x}&y={y}&z={z}"
                ]
             })
     }); 

矢量图层以及样式设定

 nodesLayer:new ol.layer.Vector({
          source: new ol.source.Vector({
           //读取geojson 的数据
               features: (new ol.format.GeoJSON()).readFeatures(JSON.stringify(nodedata))
         }),
          //根据feature属性来定样式，从来实现整体渲染，而不是进行循环操作
          style:function(feature){

              if (feature.get("level")=="2") {
                   feature.setStyle(stylesjf2);
                   console.log("first");  

             }
             else if (feature.get("level")=="1") {
                 feature.setStyle(stylesjf1);
             }
             else if (feature.get("level")=="3") {
                 feature.setStyle(stylesjf3);
             }
          },
          useSpatialIndex:false
          //style:ciclestyle
          //style:stylesjf
 }),