ArcGIS API for Javascript进行网络分析的代码

核心代码如下：

    _doFindRoute: function (fromStop, toStop) {      this.routeGraphicLayer.clear()      this.stopSymbol.setOffset(0, 20)      this.routeGraphicLayer.add(new Graphic(fromStop, this.stopSymbol))            routeTask = new RouteTask(this.routeTaskLayer)      routeParams = new RouteParameters()      routeParams.stops = new FeatureSet()      routeParams.outSpatialReference = this._map.spatialReference      var stop1 = new Graphic({        geometry: fromStop,        symbol: this.stopSymbol      })      var stop2 = new Graphic({        geometry: toStop,        symbol: this.stopSymbol      })      routeParams.stops.features.push(stop1)      routeParams.stops.features.push(stop2)      routeParams.returnRoutes = false      routeParams.returnDirections = true      routeParams.directionsLengthUnits = Units.METERS      var routeSymbol = this.routeSymbol      var graphicLayer = this._graphicLayer      var map = this._map      var _this = this      routeTask.solve(routeParams,        function (results) {          results.routeResults.forEach(function (aResult) {            aResult.directions.features.forEach(function (aRoute) {              var aRouteSymbol = new Graphic(aRoute.geometry, routeSymbol)              _this.routeGraphicLayer.add(aRouteSymbol)              if (aRoute.attributes.length > 0) {                map.setExtent(aRoute.geometry.getExtent().expand(2))              }            })          })        }.bind(this),        function (errors) {          console.log(errors.details[0])          tips('未查询到路线!')        }.bind(this))    }