Arcgis API for JS之StatisticDefinition统计

		runStaWithParam: function (classifyField, staField, staType) {//classifyField：分类字段、staField：统计字段、staType：统计类型
			require(["esri/tasks/query","esri/tasks/StatisticDefinition","esri/tasks/QueryTask"],
                function (Query,StatisticDefinition, QueryTask) {
                    
                    var query = new esri.tasks.Query();
                    query.groupByFieldsForStatistics = [classifyField];
                    //query.outSpatialReference = map.spatialReference;

                    var staDef = new esri.tasks.StatisticDefinition();
                    staDef.onStatisticField = staField;
                    staDef.outStatisticFieldName = "outSta";
                    staDef.statisticType = staType; //'count'|'sum'|'min'|'max'|'avg'|'stddev'

                    query.outStatistics = [staDef];

                    var queryTask = new esri.tasks.QueryTask(mapAddres);//mapAddres动态地图服务地址

                    queryTask.execute(query,
                        function (result) {
                            
                            if (console && console.log)
                                console.log("sta result", result);
								
                        },
                        function (error) {
                            if (console && console.log)
                                console.log("sta error", error);
                        });
                });
		}