为gooleMap V3地图类型添加标注叠加层
//比如google地图中的卫星地图上没有标准信息,下面和实现添加标注层瓦片function addMarkerLayersTile(map){//为普通地图和混合地图添加地标瓦片信息var label = new google.maps.ImageMapType({getTileUrl: function(tile, zoom) {var arr = ["mt0","mt1","mt2","mt3"];var _u = arr[Math.floor(Math.random()*arr.length)];return "http://"+_u+".google.com/vt/imgtp=png32&lyrs=h@140&hl=zh-CN&gl=cn&x="+(tile.x)+"&y="+(tile.y)+"&z="+zoom+"&s=Galil";},tileSize: new google.maps.Size(256, 256),isPng:true});map.overlayMapTypes.insertAt(0, label);}//效果见www.gpsoo.net或www.goocar.net