原文链接及内容

原文链接：https://openlayers.org/en/latest/examples/rectangle.html

运行界面

使用osm作为底图的一幅地图，渲染了一个矩形多边形要素（例如：一个边界框）

main.js代码如下：

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

import Feature from 'ol/Feature.js';
import {Vector as VectorLayer} from 'ol/layer.js';
import {Vector as VectorSource} from 'ol/source.js';
import {fromExtent} from 'ol/geom/Polygon.js';

const map = new Map({
  layers: [
    new TileLayer({
      source: new OSM(),
    }),
    new VectorLayer({
      source: new VectorSource({
        features: [
          new Feature(
            // Here a `Geometry` is expected, e.g. a `Polygon`, which has a handy function to create a rectangle from bbox coordinates
            fromExtent([-1000000, 5000000, 3000000, 7000000]), // minX, minY, maxX, maxY
          ),
        ],
      }),
    }),
  ],
  target: 'map',
  view: new View({
    center: [1000000, 6000000],
    zoom: 4,
  }),
});

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>Rectangle</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>

    <script type="module" src="main.js"></script>
  </body>
</html>