arcgis api for javascript如何讀取要素，通過ajax請求得到的。

比如：

https://gis118.arcgisonline.cn/arcgis/sharing/rest/content/items/f08f5c59cd89420abf7e585eaa260ddd/data

可以得到FeatureLayer要素服務，這里只需要配置好f08f5c59cd89420abf7e585eaa260ddd，即itemid，就可以得到operationalLayers，得到的是一個數組，然后根據類型匹配。

{"operationalLayers":[{"id":"15d1ac59ea4-layer-0","opacity":1,"title":"Aggregation of bigDataFileShares xin3 csv by hexagon bins - Aggregation of bigDataFileShares xin3 csv by hexagon bins","url":"https://gis118.arcgisonline.cn/arcgis/rest/services/Hosted/Aggregation_of_bigDataFileShares_xin3_csv_by_hexagon_bins/FeatureServer/0","visibility":true,"layerType":"ArcGISFeatureLayer","itemId":"62be1d8c97c4461383ea4ec738e96c5c","popupInfo":{"fieldInfos":[{"fieldName":"COUNT","label":"COUNT","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"COUNT_MmeUeS1apId","label":"COUNT_MmeUeS1apId","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"SUM_MmeUeS1apId","label":"SUM_MmeUeS1apId","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"MIN_MmeUeS1apId","label":"MIN_MmeUeS1apId","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"MAX_MmeUeS1apId","label":"MAX_MmeUeS1apId","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"MEAN_MmeUeS1apId","label":"MEAN_MmeUeS1apId","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"RANGE_MmeUeS1apId","label":"RANGE_MmeUeS1apId","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"SD_MmeUeS1apId","label":"SD_MmeUeS1apId","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"VAR_MmeUeS1apId","label":"VAR_MmeUeS1apId","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"COUNT_Lat","label":"COUNT_Lat","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"SUM_Lat","label":"SUM_Lat","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"MIN_Lat","label":"MIN_Lat","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"MAX_Lat","label":"MAX_Lat","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"MEAN_Lat","label":"MEAN_Lat","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"RANGE_Lat","label":"RANGE_Lat","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"SD_Lat","label":"SD_Lat","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"VAR_Lat","label":"VAR_Lat","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"COUNT_Lon","label":"COUNT_Lon","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"SUM_Lon","label":"SUM_Lon","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"MIN_Lon","label":"MIN_Lon","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"MAX_Lon","label":"MAX_Lon","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"MEAN_Lon","label":"MEAN_Lon","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"RANGE_Lon","label":"RANGE_Lon","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"SD_Lon","label":"SD_Lon","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"VAR_Lon","label":"VAR_Lon","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"COUNT_Time","label":"COUNT_Time","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"ANY_Time","label":"ANY_Time","visible":true},{"fieldName":"COUNT_UUID","label":"COUNT_UUID","visible":true,"format":{"digitSeparator":true,"places":2}},{"fieldName":"ANY_UUID","label":"ANY_UUID","visible":true},{"fieldName":"globalid","label":"globalid","visible":true},{"fieldName":"OBJECTID","label":"OBJECTID","visible":true,"format":{"digitSeparator":true,"places":2}}],"showAttachments":false,"title":"Aggregation of bigDataFileShares xin3 csv by hexagon bins - Aggregation of bigDataFileShares xin3 csv by hexagon bins","popupElements":[{"type":"fields"}]}},{"id":"15d1ac663d0-layer-1","opacity":1,"title":"MyMapService","url":"https://gis118.arcgisonline.cn/arcgis/rest/services/MyMapService/MapServer","visibility":true,"layerType":"ArcGISMapServiceLayer","itemId":"5d1ec72dc49c436cb4547df7e50785a8"}],"baseMap":{"baseMapLayers":[],"id":"15cf1a61dab-basemap-0","title":"Topographic","elevationLayers":[{"id":"globalElevation","listMode":"hide","title":"Terrain3D","url":"https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer","visibility":true,"layerType":"ArcGISTiledElevationServiceLayer"}]},"version":"1.4","authoringApp":"WebSceneViewer","authoringAppVersion":"10.5.0","presentation":{"slides":[]},"initialState":{"environment":{"lighting":{"datetime":1426395530000,"displayUTCOffset":7}},"viewpoint":{"scale":7525651.004665631,"rotation":358.5726526269468,"targetGeometry":{"x":1.172152354722387E7,"y":2931754.9651887054,"z":1401.3526187865064,"spatialReference":{"wkid":102100,"latestWkid":3857}},"camera":{"position":{"x":1.1720946560564639E7,"y":2908616.633524697,"z":3039970.5823473614,"spatialReference":{"wkid":102100,"latestWkid":3857}},"heading":1.4273473730531656,"tilt":0.3944495355698415}}},"spatialReference":{"wkid":102100,"latestWkid":3857},"viewingMode":"global"}

核心代碼：

var itemURL = portalitem + webscene + "/data";esriRequest(itemURL, {responseType: "json" }).then(function (response) {// The requested data var Layers = response.data.operationalLayers;//this.config.operationalLayers = response.data.operationalLayers; _self._getLayersData(Layers);}); },

總結

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