Openlayers 3如何使用字符串变量添加kml？

<script src="https://cdn.jsdelivr.net/npm/ol@3.20.1/dist/ol.js"></script>

<div id="map" style="width: 100%; height: 400px;"></div>

var map = new ol.Map({
  target: 'map'
});

var vectorLayer = new ol.layer.Vector({
  source: new ol.source.Vector({
    format: new ol.format.KML(),
    url: 'path/to/your/kml/file.kml' // 替换为你的KML文件路径
  })
});

map.addLayer(vectorLayer);

var kmlString = '<kml>...</kml>'; // 替换为你的KML字符串
var kmlFormat = new ol.format.KML();
var kmlFeatures = kmlFormat.readFeatures(kmlString);
vectorLayer.getSource().addFeatures(kmlFeatures);