原文链接及内容

原文链接：https://openlayers.org/en/latest/examples/bing-maps.html

运行界面

当必应地图的切片服务没有给定分辨率和区域时，它会返回“占位符”切片，即在将地图缩放到19级以上（这里必应地图的最大缩放等级为19），可以看到“占位符”贴图(即超出一定层级时会没有该层级切片，则会显示空白)。如果你想让OpenLayers在缩放级别超出19时显示拉伸的切片（即拉伸最大的那个等级的切片），那么需要给ol/source/BingMaps类对象的maxZoom属性设置为19。

main.js代码如下：

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import BingMaps from 'ol/source/BingMaps.js';
import Map from 'ol/Map.js';
import TileLayer from 'ol/layer/Tile.js';
import View from 'ol/View.js';

const styles = [
  'RoadOnDemand',
  'Aerial',
  'AerialWithLabelsOnDemand',
  'CanvasDark',
  'OrdnanceSurvey',
];
const layers = [];
let i, ii;
for (i = 0, ii = styles.length; i < ii; ++i) {
  layers.push(
    new TileLayer({
      visible: false,
      preload: Infinity,
      source: new BingMaps({
        key: 'Your Bing Maps Key from https://www.bingmapsportal.com/ here',
        imagerySet: styles[i],
        // use maxZoom 19 to see stretched tiles instead of the BingMaps
        // "no photos at this zoom level" tiles
        // 设置 maxZoom 为19（这里最大等级为19）则可以看到拉伸后切片，因为超过此缩放级别必应地图则没有切片(图片)数据
        // maxZoom: 19
      }),
    })
  );
}
const map = new Map({
  layers: layers,
  target: 'map',
  view: new View({
    center: [-6655.5402445057125, 6709968.258934638],
    zoom: 13,
  }),
});

const select = document.getElementById('layer-select');
function onChange() {
  const style = select.value;
  for (let i = 0, ii = layers.length; i < ii; ++i) {
    layers[i].setVisible(styles[i] === style);
  }
}
select.addEventListener('change', onChange);
onChange();

界面布局文件index.html代码如下：

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Bing Maps</title>
    <link rel="stylesheet" href="node_modules/ol/ol.css">
    <style>
      .map {
        width: 100%;
        height: 400px;
      }
    </style>
  </head>
  <body>
     <div id="map" class="map"></div>
     <select id="layer-select">
       <option value="Aerial">Aerial</option>
       <option value="AerialWithLabelsOnDemand" selected>Aerial with labels</option>
       <option value="RoadOnDemand">Road</option>
       <option value="CanvasDark">Road dark</option>
       <option value="OrdnanceSurvey">Ordnance Survey</option>
     </select>
    <!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
    <!-- 针对老的浏览器需要添加polyfill库——关于鼠标指针事件, see https://caniuse.com/#feat=pointer -->
    <script src="https://cdn.jsdelivr.net/npm/elm-pep@1.0.6/dist/elm-pep.js"></script>
    <script type="module" src="main.js"></script>
  </body>
</html>