arcgis api for js 4.x调用自己发布的路径分析服务，初始化显示特别小

最好把你都代码贴出来，默认在二维下，如果只加载一个地图的话，显示范围是这个地图的fullExtent，如果加了多个图层，那么会显示范围更大的那个，另外发布服务的时候如果extent不正确，也是会影响到前端加载显示的范围的

require([
        "esri/Map",
        "esri/views/MapView",
        "esri/Graphic",
        "esri/layers/GraphicsLayer",
        "esri/tasks/RouteTask",
        "esri/tasks/support/RouteParameters",
        "esri/tasks/support/FeatureSet",
        "esri/layers/MapImageLayer",
        "esri/layers/TileLayer",
        "esri/Basemap",
        "esri/symbols/SimpleMarkerSymbol",
        "esri/symbols/TextSymbol",
        "esri/widgets/Home"
      ], function (
        Map,
        MapView,
        Graphic,
        GraphicsLayer,
        RouteTask,
        RouteParameters,
        FeatureSet,
        MapImageLayer,
        TileLayer,
        Basemap,
        SimpleMarkerSymbol,
        TextSymbol,
        Home
      ) {
        // Point the URL to a valid route service that uses an
        // ArcGIS Online hosted service proxy
        var routeTask = new RouteTask({
          url:
            "https://192.168.1.244:6443/arc ... ot%3B
        });
        // The stops and route result will be stored in this layer
        var routeLayer = new GraphicsLayer();
        // Setup the route parameters
        var routeParams = new RouteParameters({
          stops: new FeatureSet(),
          barriers:new FeatureSet(),
          returnDirections:false,
          returnRoutes:true,
          outSpatialReference: {
            // autocasts as new SpatialReference()
            wkid: 3857
          }
        });
        // Define the symbology used to display the stops
        var stopSymbol = {
          type: "simple-marker", // autocasts as new SimpleMarkerSymbol()
          style: "circle", 
          color: "blue",
          size: 10,
          outline: {
            // autocasts as new SimpleLineSymbol()
            width: 3
          }
        };
        var barriersSymbol = {
          type: "simple-marker", // autocasts as new SimpleMarkerSymbol()
          style: "x",
          color:"red",
          size: 10,
          outline: {
            // autocasts as new SimpleLineSymbol()
            width: 4
          }
        };
        
        var layer=new MapImageLayer({
          url:"https:///arcgis/rest/services/ ... ot%3B
          });
        
        var map = new Map({
          basemap: "",
          layers: [layer,routeLayer] // Add the route layer to the map
        });
        var view = new MapView({
          container: "viewDiv", // Reference to the scene div created in step 5
          map: map// Reference to the map object created before the scene
        });
        var homeBtn = new Home({
          view: view
        });
      view.ui.add(homeBtn, "top-left");
        view.scale = 240;
        view.center = [115.782939, 33.869338];  // Sets the center point of the view at a specified lon/lat
        view.zoom = 15;  // Sets 
        var selectPointID;
        //给停靠点按钮添加点击事件
        document.getElementById("stop").addEventListener("click",function(){
                    selectPointID = 1;
        });
        
        //给障碍点按钮添加点击事件
        document.getElementById("barriers").addEventListener("click",function(){
                    selectPointID = 2;
        })
        
        view.on("click", function(event){
                    //通过selectPointID判断是添加是停靠点还是障碍点
                    switch (selectPointID) {
                        case 0:
                            break;
                        case 1:
                            var stop = new Graphic({
                                    geometry: event.mapPoint,
                                    symbol: stopSymbol
                                });
                            
                            routeLayer.add(stop);
                            routeParams.stops.features.push(stop);
                            break;
                        case 2:
                            //获得障碍点的坐标
                            var barrier=new Graphic({
                                    geometry: event.mapPoint,
                                    symbol: barriersSymbol
                                });
                            routeLayer.add(barrier);
                                // Execute the route task if 2 or more stops are input
                            routeParams.barriers.features.push(barrier);
                            break;
                    }
                    //如果selectPointID不等于0，将点的坐标在地图上显示出来
                    if (selectPointID != 0) {
                        addTextPoint("停靠点", stop, stopSymbol);
                        addTextPoint("障碍点", barrier, barriersSymbol);
                        selectPointID = 0;
                    }
         });       
         function addTextPoint(text,point,symbol) {
          var textSymbol = {
              type: "text",  // autocasts as new TextSymbol()
              text: text,
              color:[128, 0, 0],
              };                            
           var graphicText = new Graphic({
                        geometry:point,
                        symbol: textSymbol
                    });
           var graphicpoint = new Graphic({
                        geometry: point,
                        symbol: symbol
                    } );
                    //用默认的图层添加
            view.graphics.add(graphicpoint);
            view.graphics.add(graphicText);
        };
       
        document.getElementById("analyse").addEventListener("click",function(){
                    //如果障碍点或者停靠点的个数有一个为0，提示用户参数输入不对
                    if  (routeParams.stops.features.length  ==  0  || routeParams.barriers.features.length==0)
                    {
                        alert("输入参数不全，无法分析");
                        return;
                    }
                    //执行路径分析函数
                    routeTask.solve(routeParams).then(showRoute)
         });
         function showRoute(solveResult) {
                    //路径分析的结果
                    var routeResults = solveResult.routeResults;
                    //路径分析的长度
                    var res = routeResults.length;
                    //路径的符号
                    var routeSymbol = {
                        type: "simple-line", // autocasts as SimpleLineSymbol()
                        color: [0, 0, 255, 0.5],
                        width: 5
                        };
                    if (res > 0) {
                        for (var i = 0; i < res; i++) {
                            var routeResult = routeResults[i].route;
                            routeResult.symbol=routeSymbol;
                            routeLayer.add(routeResult);
                        }
                    }
                    else {
                        alert("没有返回结果");
                    }
   
        }     
      });
 

你的地图 如果不是4326 center不能[115.782939, 33.869338]这么写，要创建符合你的坐标系的坐标值的点对象。