Kml

<!--
  说明：KML 面状要素
  核心逻辑：ol.format.KML 解析内联面与线，按几何类型分样式渲染
  依赖：OpenLayers 10.3.1 · jsDelivr CDN
-->
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta name="robots" content="noindex,follow">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>KML 面状要素</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/ol@10.3.1/ol.css">
<style>
  html,body{height:100%;margin:0}
  body{display:flex;flex-direction:column;overflow:hidden;
       font:13px/1.6 -apple-system,"Segoe UI","PingFang SC",sans-serif}
  .bar{flex:0 0 auto;padding:8px 12px;background:#f6f7f9;border-bottom:1px solid #e3e6ea;
       display:flex;gap:10px;align-items:center;font-size:12px;color:#58606e;flex-wrap:wrap}
  .bar button{font:inherit;padding:4px 10px;border:1px solid #c9d0da;border-radius:5px;
              background:#fff;color:#1f2a37;cursor:pointer}
  #info{margin-left:auto}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3}
</style>
</head>
<body>
<div class="bar">
  <span>数据：页面内联 KML</span>
  <button id="again">重新解析</button>
  <span id="info">—</span>
</div>
<div id="map"></div>
<script src="https://cdn.jsdelivr.net/npm/ol@10.3.1/dist/ol.js"></script>
<script>
(function () {
  'use strict';

  if (typeof ol === 'undefined') {
    document.getElementById('map').innerHTML =
      '<div style="padding:20px;color:#b42318">OpenLayers 加载失败，请检查能否访问 cdn.jsdelivr.net</div>';
    return;
  }

  var fromLonLat = ol.proj.fromLonLat;

  var kml = '<?xml version="1.0" encoding="UTF-8"?>' +
    '<kml xmlns="http://www.opengis.net/kml/2.2"><Document>' +
    '<Placemark><name>示范区边界</name><Polygon><outerBoundaryIs><LinearRing><coordinates>' +
    '116.30,39.88 116.46,39.87 116.48,39.98 116.34,40.00 116.29,39.94 116.30,39.88' +
    '</coordinates></LinearRing></outerBoundaryIs></Polygon></Placemark>' +
    '<Placemark><name>巡护路线</name><LineString><coordinates>' +
    '116.32,39.90 116.38,39.93 116.42,39.96 116.46,39.92 116.40,39.89' +
    '</coordinates></LineString></Placemark>' +
    '<Placemark><name>监测点</name><Point><coordinates>116.39,39.94,0</coordinates></Point></Placemark>' +
    '</Document></kml>';

  var format = new ol.format.KML();
  var source = new ol.source.Vector();

  var layer = new ol.layer.Vector({
    source: source,
    style: function (feature) {
      var geom = feature.getGeometry();

      if (geom instanceof ol.geom.Polygon) {
        return new ol.style.Style({
          fill: new ol.style.Fill({ color: 'rgba(31,95,208,0.16)' }),
          stroke: new ol.style.Stroke({ color: '#1f5fd0', width: 2.5 }),
          text: new ol.style.Text({
            text: feature.get('name') || '',
            font: '600 12px sans-serif',
            fill: new ol.style.Fill({ color: '#123b78' }),
            stroke: new ol.style.Stroke({ color: '#ffffff', width: 3 })
          })
        });
      }

      if (geom instanceof ol.geom.LineString) {
        return new ol.style.Style({
          stroke: new ol.style.Stroke({ color: '#e06a3b', width: 3.5, lineDash: [10, 6] })
        });
      }

      return new ol.style.Style({
        image: new ol.style.Circle({
          radius: 6,
          fill: new ol.style.Fill({ color: '#c8281c' }),
          stroke: new ol.style.Stroke({ color: '#ffffff', width: 2 })
        }),
        text: new ol.style.Text({
          text: feature.get('name') || '',
          font: '600 12px sans-serif',
          offsetY: -15,
          fill: new ol.style.Fill({ color: '#16181d' }),
          stroke: new ol.style.Stroke({ color: '#ffffff', width: 3 })
        })
      });
    }
  });

  var map = new ol.Map({
    target: 'map',
    layers: [new ol.layer.Tile({ source: new ol.source.XYZ({url: 'https://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer/tile/{z}/{y}/{x}', attributions: 'Tiles © Esri'}) }), layer],
    view: new ol.View({ center: fromLonLat([116.39, 39.94]), zoom: 11, minZoom: 2, maxZoom: 19 }),
    controls: ol.control.defaults.defaults({ attribution: false, rotate: false })
  });

  var info = document.getElementById('info');

  function load() {
    source.clear();
    var feats = format.readFeatures(kml, {
      dataProjection: 'EPSG:4326',
      featureProjection: 'EPSG:3857'
    });
    source.addFeatures(feats);
    map.getView().fit(source.getExtent(), { padding: [80, 80, 80, 80], duration: 400 });
    info.textContent = '解析到 ' + feats.length + ' 个要素';
  }

  document.getElementById('again').addEventListener('click', load);
  load();
})();
</script>
</body>
</html>