Rich Text Labels

<!--
  示例：富文本标注
  要点：ol.style.Text 支持字体字重、背景底色、内边距与描边组合
  依赖：OpenLayers 10.3.1 · jsDelivr CDN（底图 OSM，无 Key）
-->
<!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>富文本标注</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;color:#16181d}
  .bar{flex:0 0 auto;padding:8px 12px;background:#f6f7f9;border-bottom:1px solid #e3e6ea;
       display:flex;gap:14px;align-items:center;font-size:12px;color:#58606e;flex-wrap:wrap}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3}
</style>
</head>
<body>
<div class="bar"><span>同一份数据用三套标注：底片式、胶囊标签、纯描边</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 (!window.ol) {
    document.getElementById('map').textContent = 'OpenLayers 加载失败，请检查 cdn.jsdelivr.net 是否可访问';
    return;
  }

  var items = [
    ['中山公园', 116.391, 39.907],
    ['东单体育场', 116.418, 39.906],
    ['王府井书店', 116.411, 39.914],
    ['南锣鼓巷', 116.403, 39.937],
    ['什刹海', 116.386, 39.941],
    ['天坛', 116.410, 39.882]
  ];

  function featureOf(item, idx, kind) {
    return new ol.Feature({
      geometry: new ol.geom.Point(ol.proj.fromLonLat([item[1], item[2]])),
      name: item[0],
      kind: kind
    });
  }

  var feats = [];
  items.forEach(function (it, i) {
    feats.push(featureOf(it, i, i % 3));
  });

  /* 三套文字样式：描边白字、深底白字胶囊、粗体无底 */
  function textStyle(kind, name) {
    if (kind === 0) {
      return new ol.style.Text({
        text: name,
        font: '600 13px "PingFang SC", sans-serif',
        offsetY: -18,
        fill: new ol.style.Fill({ color: '#16181d' }),
        stroke: new ol.style.Stroke({ color: '#ffffff', width: 4, lineJoin: 'round' })
      });
    }
    if (kind === 1) {
      return new ol.style.Text({
        text: name,
        font: '500 12px "PingFang SC", sans-serif',
        offsetY: -20,
        padding: [4, 8, 4, 8],
        fill: new ol.style.Fill({ color: '#ffffff' }),
        backgroundFill: new ol.style.Fill({ color: 'rgba(24,32,44,.86)' }),
        backgroundStroke: new ol.style.Stroke({ color: 'rgba(255,255,255,.6)', width: 1 })
      });
    }
    return new ol.style.Text({
      text: name,
      font: 'bold italic 13px Georgia, serif',
      offsetY: -18,
      fill: new ol.style.Fill({ color: '#8a3ab0' }),
      stroke: new ol.style.Stroke({ color: 'rgba(255,255,255,.95)', width: 5 })
    });
  }

  var layer = new ol.layer.Vector({
    source: new ol.source.Vector({ features: feats }),
    style: function (f) {
      return new ol.style.Style({
        image: new ol.style.Circle({
          radius: 4,
          fill: new ol.style.Fill({ color: '#1f5fd0' })
        }),
        text: textStyle(f.get('kind'), f.get('name'))
      });
    }
  });

  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: ol.proj.fromLonLat([116.400, 39.912]), zoom: 14 }),
    controls: ol.control.defaults.defaults({ attribution: false, rotate: false })
  });
})();
</script>
</body>
</html>