<!DOCTYPE html>
<html>
  <head>
    <title>WKT</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/css/ol.css" type="text/css">
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
		<script type="text/javascript" src="https://openlayers.org/en/v5.3.0/build/ol.js"></script>
 
  </head>
  <body>
    <div id="map" class="map"></div>
		<script> 
			// 底图
      var raster = new ol.layer.Tile({
        source: new ol.source.OSM()
      });
 
      var wkt = 'POLYGON((10.689 -25.092, 34.595 ' +
          '-20.170, 38.814 -35.639, 13.502 ' +
          '-39.155, 10.689 -25.092))';
 
			var format = new ol.format.WKT();
			
			// wkt转feature
      var feature = format.readFeature(wkt, {
        dataProjection: 'EPSG:4326', //	目标坐标系
        featureProjection: 'EPSG:3857'// 当前坐标系
      });
 
			// wkt转feature构建矢量图
      var vector = new ol.layer.Vector({
        source: new ol.source.Vector({
          features: [feature]
        })
      });
			// 将两个图层加到地图对象
      var map = new ol.Map({
        layers: [raster, vector],
        target: 'map',
        view: new ol.View({
          center: [2952104.0199, -3277504.823],
          zoom: 4
        })
      });
    </script>
  </body>
</html>