MapView以倾斜而非顶部显示地图

Question

谁知道为什么地图显示为倾斜而不是顶视图？我在地图上使用带有WMS的arcgis js。在体内，您需要放置一个div：

<div id="viewDiv"></div>

这是我的js代码：

var map, view, layer;

    require([
        "esri/tasks/Locator",
        "esri/Map",
        "esri/views/MapView",
        "esri/layers/WMSLayer"
    ], function (Locator, Map, MapView, WMSLayer) {
        layer = new WMSLayer({
            url: 'https://geoservices.informatievlaanderen.be/raadpleegdiensten/GRB-basiskaart/wms'
        });

        var locatorTask = new Locator({
            url:
                "https://geocode.arcgis.com/arcgis/rest/services/World/GeocodeServer"
        });

        map = new Map({
            basemap: {
                baseLayers: [layer]
            }
        });

        view = new MapView({
            map: map,
            container: "viewDiv",
            constraints: {
                rotationEnabled: false
            }
        });
    });