Javascript API 中如何使用join DataSource 作为数据源进行查询

var rightTableSource = new LayerDataSource();

  rightTableSource.dataSource = new TableDataSource({

  workspaceId: [workspaceid],

  dataSourceName: [tablename]

});

var leftTableSource = new LayerMapSource({

  mapLayerId: 0

});

var joinDataSource = new JoinDataSource({

  joinType: left-outer-join,

  leftTableKey: Name,

  rightTableKey: Name,

  leftTableSource: leftTableSource,

  rightTableSource: rightTableSource

});

var layerDataSource = new LayerDataSource();

layerDataSource.dataSource = joinDataSource;





var featureLayer = new FeatureLayer([urltomapservice]/dynamicLayer, {  

  id: featureLayer,  

  mode: FeatureLayer.MODE_ONDEMAND,  

  source: layerDataSource ,  

  outFields: [*]  

});