var pipeLayer=new ol.layer.Tile({

          extent: [11827395.404512288,3049293.321033439,11830835.070785211,3051032.263426973],

          source: new ol.source.TileArcGISRest({

               url: baseMapUrl+'arcgis/rest/services/给水管网/MapServer',

                params: {

                    'LAYERS': 'show:0,1'

                }

              }),

              name:'pipeLayer',

              label:'管网',

              group:'给水管网'

           });

pipeLayer.getSource().updateParams({LAYERS:'show:1'});

    controls: ol.control.defaults({  

                                        attribution:false,

                                         rotate:false

                           }).extend([ new ol.control.FullScreen({ className:"mapFullScreen"})])；