Mobile Full Screen

<!--
  说明：移动端全屏
  核心逻辑：html/body/容器 100% 高度贯通，按钮调用 requestFullscreen 进入系统全屏
  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, maximum-scale=1, user-scalable=no">
<title>移动端全屏</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:10px 12px;background:#f6f7f9;border-bottom:1px solid #e3e6ea;
       display:flex;gap:10px;align-items:center;font-size:12px;color:#58606e}
  .bar button{font:inherit;padding:6px 12px;border:1px solid #c9d0da;border-radius:6px;
              background:#fff;color:#1f2a37}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3}
  #info{margin-left:auto}
</style>
</head>
<body>
<div class="bar">
  <button id="fs">进入全屏</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 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'}) })],
    view: new ol.View({ center: fromLonLat([116.391, 39.907]), zoom: 11, minZoom: 2, maxZoom: 19 }),
    controls: ol.control.defaults.defaults({
      attribution: false,
      rotate: false,
      zoom: true
    })
  });

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

  function report() {
    info.textContent = window.innerWidth + ' × ' + window.innerHeight +
      (document.fullscreenElement ? ' · 全屏' : ' · 窗口');
    map.updateSize();
  }

  btn.addEventListener('click', function () {
    if (document.fullscreenElement) {
      if (document.exitFullscreen) document.exitFullscreen();
    } else {
      var el = document.documentElement;
      var req = el.requestFullscreen || el.webkitRequestFullscreen;
      if (req) req.call(el);
    }
  });

  document.addEventListener('fullscreenchange', function () {
    btn.textContent = document.fullscreenElement ? '退出全屏' : '进入全屏';
    setTimeout(report, 60);
  });

  window.addEventListener('resize', report);
  report();
})();
</script>
</body>
</html>