ES6： fetch使用示例

一个获取geojson数据后构建graphic加载到地图上的示例

createMap() {
      esriLoader.dojoRequire([
        "esri/Map",
        "esri/views/MapView",
        "esri/Graphic",
        "esri/Basemap",
        "esri/layers/MapImageLayer",
        "esri/geometry/SpatialReference",
        "dojo/domReady!"
      ], (Map,MapView,Graphic,Basemap,MapImageLayer, SpatialReference) => {
        baselayer().then(l => {
          this.map = new Map({
            basemap: new Basemap({
              baseLayers: [
                l
              ],
            })
          });
          let view = new MapView({
            container: "MyMapDiv",
            map: this.map,
            center: [120.2, 30.26],
            zoom: 12,
            spatialReference: new SpatialReference({ wkid: 4326 })
          });

        let geojsonUrl = "https://lxqjss.github.io/data/jiangganoutline.geojson";
      fetch(geojsonUrl).then(function(response) {
        return response.json();
      }).then(function(data) {
        // console.log(data);
        let outlineArr = data.features[0].geometry.coordinates;
        console.log(outlineArr[0]);
        let polygon = {
          type: "polygon",
          rings: outlineArr
        };
        let fillSymbol = {
          type: "simple-fill",
          color: [0, 0, 0, 0.5],
          outline: {
            color: [0, 0, 0],
            width: 1
          }
        };

        let polygonGraphic = new Graphic({
          geometry: polygon,
          symbol: fillSymbol
        });
        view.graphics.addMany([polygonGraphic]);

      }).catch(function(e) {
        console.log("Oops, error");
      });

更多关于es2015 fetch的介绍参考# 传统 Ajax 已死，Fetch 永生