arcgis for javascript 添加featurelayer,设置地图最大最小等级

    var map;  
    var livingCenter;  
    var livingCenterUrl = "http://172.31.170.98:6080/arcgis/rest/services/livingcenter/FeatureServer/0";  
    var featureLayer;  
    var featureLayerUrl = "http://172.31.170.98:6080/arcgis/rest/services/layer_living/FeatureServer/0";  
      
    map = new Map("map", {  
        center: [122.12, 37.48],  
        zoom: 7,  
        maxZoom:11,//最大空间等级  
        minZoom:6,//最小空间等级  
        slider:false,//隐藏比例尺控件  
        logo:false,//隐藏logo  
        basemap: "shiliang",  
        height:"100%"  
    });  
    featureLayer = new FeatureLayer(featureLayerUrl, {  
          id : "featureLayer",  
          mode: FeatureLayer.MODE_ONDEMAND,  
          outFields: ["*"]  
    });  
    featureLayer.setOpacity(0.6);  
    livingCenter = new FeatureLayer(livingCenterUrl,{  
            id : "livingCenter",  
                    mode: FeatureLayer.MODE_ONDEMAND,  
                    outFields: ["*"]      
    });  
    map.addLayers([featureLayer,livingCenter]);