arcgis api for js之setVisibleLayers（设置动态地图服务中图层的显隐）

require([
  "esri/layers/ArcGISDynamicMapServiceLayer"  
], function(ArcGISDynamicMapServiceLayer ) {
  var layer = new ArcGISDynamicMapServiceLayer(url);//url=xx/xx/MapServer为动态地图服务, MapServer中有若干个图层，0,1,2,...n
  var visible = [];
  visible.push(id);//id为动态地图服务中的图层id，如0,1,2,3,...,n图层
  layer.setVisibleLayers(visible);
  map.addLayer(layer);
});