BingImageStyle BingImageStyle Bing瓦片类型 Members constantArialWithLabels = "AerialWithLabels", 带标注卫星影像 constantRoad = "Road", 道路 constantCanvasDark = "CanvasDark", 暗色地图 constantCanvasLight = "CanvasLight", 亮色地图 constantCanvasGray = "CanvasGray", 灰色地图 Methods