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1.arcgis for js中实现计算面积和周长需要两个服务地址，一个为地图切片资源地址，一个为计算面积和长度的工具服务地址，都可以在本地发布的 arcgis server manager中拿到；
显示js 代码
var map, tb; var geometryService; require([ "esri/map", "esri/toolbars/draw", "esri/symbols/SimpleMarkerSymbol", "esri/symbols/SimpleFillSymbol", "esri/symbols/PictureFillSymbol", "esri/symbols/CartographicLineSymbol", "esri/graphic", "esri/Color", "dojo/dom", "dojo/on", "esri/layers/ArcGISTiledMapServiceLayer", "esri/tasks/GeometryService","esri/SpatialReference","esri/tasks/ProjectParameters","esri/tasks/AreasAndLengthsParameters", "dojo/domReady!" ], function( Map, Draw, SimpleMarkerSymbol, SimpleFillSymbol, PictureFillSymbol, CartographicLineSymbol, Graphic, Color, dom, on, ArcGISTiledMapServiceLayer,GeometryService,SpatialReference,ProjectParameters,AreasAndLengthsParameters ) { map = new Map("mapDiv", { "xmin":126.08797131337525,"ymin":41.88483304829672,"xmax":130.05572254059723,"ymax":47.20292839632739, "spatialReference":{"wkid":4326} }); map.on("load", initToolbar); var oilAndGasLayer = new ArcGISTiledMapServiceLayer("http://localhost:6080/arcgis/rest/services/itms/MapServer"); map.addLayer(oilAndGasLayer); geometryService=GeometryService("http://localhost:6080/arcgis/rest/services/Utilities/Geometry/GeometryServer"); geometryService.on("areas-and-lengths-complete", function(evt) { var result = evt.result; dom.byId("area").innerHTML = result.areas[0].toFixed(3) + " acres"; dom.byId("length").innerHTML = result.lengths[0].toFixed(3) + " feet"; }); function initToolbar() { tb = new Draw(map); tb.on("draw-complete", addGraphic); tb.activate(Draw.FREEHAND_POLYGON); } function addGraphic(evt) { var geometry = evt.geometry; map.graphics.clear(); map.graphics.add(new Graphic(geometry, new SimpleFillSymbol())); var areasAndLengthParams = new AreasAndLengthsParameters(); areasAndLengthParams.lengthUnit = GeometryService.UNIT_FOOT; areasAndLengthParams.areaUnit = GeometryService.UNIT_ACRES; areasAndLengthParams.calculationType = "geodesic"; geometryService.simplify([geometry], function (simplifiedGeometries) { areasAndLengthParams.polygons = simplifiedGeometries; geometryService.areasAndLengths(areasAndLengthParams); }); } });
创建DIV为
<body><div id="mapDiv" style="height: 95%"></div>Length: <span id="length"></span><br>Area: <span id="area"></span></body>引用资源类为（实现资源类需要本地搭建arcgis api服务）
<link rel="stylesheet" type="text/css" href="http://localhost:8087/arcgis_js_api/library/3.22/3.22/esri/css/esri.css" /> <script src="http://localhost:8087/arcgis_js_api/library/3.22/3.22/init.js"></script> <script src="../js/jquery-1.3.1.js"></script>
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