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<!--
  示例：另类瓦片源 — OpenLayers google
  核心逻辑：用 XYZ 源显式给出 url 模板、attributions 与 crossOrigin，演示第三方瓦片接入写法
  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>另类瓦片源</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:12px;align-items:center;font-size:12px;color:#58606e;flex-wrap:wrap}
  .bar label{display:flex;gap:5px;align-items:center;cursor:pointer}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3}
</style>
</head>
<body>
<div class="bar">
  <label><input type="checkbox" id="tgl" checked> 自定义 XYZ 源</label>
  <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 infoEl = document.getElementById('info');
  var requested = 0;

  /* 第三方底图接入的核心参数：地址模板、版权声明、跨域、最大级别 */
  var customSource = new ol.source.XYZ({
    url: 'https://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer/tile/{z}/{y}/{x}',
    attributions: 'Tiles © Esri',
    crossOrigin: 'anonymous',
    maxZoom: 19,
    tileLoadFunction: function (image, src) {
      requested++;
      image.getImage().src = src;
    }
  });

  customSource.on('tileloadend', function () {
    infoEl.textContent = '已请求 ' + requested + ' 张瓦片';
  });
  customSource.on('tileloaderror', function () {
    infoEl.textContent = '瓦片加载失败，检查网络或地址模板';
  });

  var customLayer = new ol.layer.Tile({ source: customSource });

  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'}), opacity: 0.5 }),
      customLayer
    ],
    view: new ol.View({
      center: ol.proj.fromLonLat([116.391, 39.907]),
      zoom: 12,
      minZoom: 2,
      maxZoom: 19
    }),
    controls: ol.control.defaults.defaults({ attribution: false })
  });

  document.getElementById('tgl').addEventListener('change', function () {
    customLayer.setVisible(this.checked);
  });
})();
</script>
</body>
</html>