Basic Map

<!--
  示例：MapLibre 基础地图
  核心逻辑：加载 demo 样式，添加导航与比例尺控件，移动结束后回读视角
  依赖：MapLibre GL JS 4 · jsDelivr CDN · demotiles 免 Key 样式
-->
<!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>基础地图</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/maplibre-gl@4/dist/maplibre-gl.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;display:flex;gap:14px;align-items:center;padding:8px 12px;
       background:#f6f7f9;border-bottom:1px solid #e3e6ea;font-size:12px;color:#58606e;flex-wrap:wrap}
  .bar b{color:#16181d;font-weight:600}
  #map{flex:1 1 auto;min-height:0}
</style>
</head>
<body>
<div class="bar">
  <span>中心 <b id="c">—</b></span>
  <span>缩放 <b id="z">—</b></span>
  <span>俯仰 <b id="p">—</b></span>
  <span>拖动 · 滚轮缩放 · 右键旋转</span>
</div>
<div id="map"></div>
<script src="https://cdn.jsdelivr.net/npm/maplibre-gl@4/dist/maplibre-gl.js"></script>
<script>
(function () {
  'use strict';

  if (typeof maplibregl === 'undefined') {
    document.body.innerHTML =
      '<div style="padding:24px;color:#b42318">MapLibre 加载失败，请检查能否访问 cdn.jsdelivr.net</div>';
    return;
  }

  var map = new maplibregl.Map({
    container: 'map',
    style: 'https://demotiles.maplibre.org/style.json',
    center: [104.2, 35.5],
    zoom: 3,
    attributionControl: {
      compact: true,
      customAttribution: 'MapLibre demo tiles'
    }
  });

  map.addControl(new maplibregl.NavigationControl({
    showCompass: true,
    showZoom: true,
    visualizePitch: true
  }), 'top-right');

  map.addControl(new maplibregl.ScaleControl({
    maxWidth: 120,
    unit: 'metric'
  }), 'bottom-left');

  function readView() {
    var c = map.getCenter();
    document.getElementById('c').textContent =
      c.lng.toFixed(3) + ', ' + c.lat.toFixed(3);
    document.getElementById('z').textContent = map.getZoom().toFixed(2);
    document.getElementById('p').textContent = map.getPitch().toFixed(0) + '°';
  }

  map.on('moveend', readView);
  map.on('load', readView);

  map.on('error', function (e) {
    if (e.error) console.warn('地图错误：' + e.error.message);
  });
})();
</script>
</body>
</html>