如何在arcgis 4.x中显示抖动强度？

require([
  "esri/Map",
  "esri/views/MapView",
  "esri/layers/FeatureLayer",
  "esri/renderers/SimpleRenderer",
  "esri/symbols/SimpleMarkerSymbol",
  "esri/symbols/SimpleLineSymbol",
  "esri/symbols/SimpleFillSymbol"
], function(Map, MapView, FeatureLayer, SimpleRenderer, SimpleMarkerSymbol, SimpleLineSymbol, SimpleFillSymbol) {
  // 创建地图对象
  var map = new Map({
    basemap: "streets"
  });

  // 创建地图视图对象
  var view = new MapView({
    container: "mapView",
    map: map,
    zoom: 12,
    center: [-118.2437, 34.0522]
  });

  // 创建要素图层
  var featureLayer = new FeatureLayer({
    url: "https://services.arcgis.com/{your-service-url}/FeatureServer/0"
  });

  // 创建渲染器
  var renderer = new SimpleRenderer({
    symbol: new SimpleMarkerSymbol({
      style: "circle",
      color: "blue",
      size: 8,
      outline: new SimpleLineSymbol({
        style: "solid",
        color: "white",
        width: 1
      })
    }),
    visualVariables: [{
      type: "size",
      field: "shaking_intensity",
      stops: [{
        value: 1,
        size: 8
      }, {
        value: 10,
        size: 24
      }]
    }]
  });

  // 将渲染器设置为图层的渲染属性
  featureLayer.renderer = renderer;

  // 将图层添加到地图视图中
  map.add(featureLayer);
});