Arcgis api3.x加载自定义点

loadModules(["esri/graphic", "esri/layers/GraphicsLayer", "esri/symbols/PictureMarkerSymbol", "esri/geometry/Point"]).then(([Graphic, GraphicsLayer, PictureMarkerSymbol, Point]) => {
                const graphicLayer = new GraphicsLayer();
                const dataAll: any[] = []
                data.forEach((item: any) => {
                    const { alertType, alertData } = item;
                    alertData.forEach((item: any) => item.type = alertType);
                    dataAll.push(...alertData)
                })
                let symbo = new PictureMarkerSymbol({
                    "url": img1,
                    "type": "esriPMS",
                    width: 20,
                    height: 19
                });
                dataAll.forEach(item => {
                    const { type, x, y } = item;
                    let point = new Point({ "x": x, "y": y, "spatialReference": { "wkid": 4490 } });



                    if (type === '二月预警') {
                        symbo.url = img2


                    }
                    if (type === '三月预警') {
                        symbo.url = img3
                    }
                    var graphic = new Graphic(point, symbo, item);
                    graphicLayer.add(graphic)
                })
                map.addLayer(graphicLayer)
                graphicLayer.on('click', (e: any) => {
                    console.log(e);
                })
            })