Tilejson

<!--
  示例：OpenLayers TileJSON 数据源
  要点：直接以页面内 TileJSON 对象构造 ol.source.TileJSON，不发起元数据请求
  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>TileJSON 数据源</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:10px;align-items:center;flex-wrap:wrap;font-size:12px;color:#58606e}
  .bar label{display:flex;gap:5px;align-items:center;cursor:pointer}
  .bar select,.bar input[type=range]{font-size:12px}
  .bar .val{font-family:ui-monospace,Consolas,monospace;color:#1f5fd0;min-width:44px}
  .bar .sep{width:1px;height:16px;background:#d8dce2}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3}
</style>
</head>
<body>
<div class="bar">
  <span>页面内 TileJSON</span>
  <span class="sep"></span>
  <span id="info">准备中…</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').textContent = 'OpenLayers 加载失败，请检查能否访问 cdn.jsdelivr.net';
    return;
  }


  var tileJSON = {
    tilejson: '3.0.0',
    name: 'OSM 演示瓦片',
    scheme: 'xyz',
    tiles: ['https://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer/tile/{z}/{y}/{x}'],
    minzoom: 0,
    maxzoom: 19,
    bounds: [-180, -85.0511, 180, 85.0511],
    attribution: 'Tiles © Esri'
  };

  var source = new ol.source.TileJSON({
    tileJSON: tileJSON,
    crossOrigin: 'anonymous'
  });

  var map = new ol.Map({
    target: 'map',
    layers: [new ol.layer.Tile({source: source})],
    view: new ol.View({
      center: ol.proj.fromLonLat([116.391, 39.907]),
      zoom: 8
    })
  });

  source.on('change', function () {
    if (source.getState() === 'ready') {
      document.getElementById('info').textContent =
        '层级 ' + tileJSON.minzoom + '–' + tileJSON.maxzoom + ' · ' +
        tileJSON.name;
    }
  });

  if (source.getState() === 'ready') {
    document.getElementById('info').textContent =
      '层级 ' + tileJSON.minzoom + '–' + tileJSON.maxzoom + ' · ' +
      tileJSON.name;
  }

})();
</script>
</body>
</html>