Two Finger Pan Scroll

<!--
  示例：OpenLayers 双指平移与滚动
  要点：改写 DragPan 与 MouseWheelZoom 条件，触屏双指或按住平台修饰键才移动地图
  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>双指平移与滚动</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>单指拖动无反应 · 双指拖动平移 · Ctrl / ⌘ + 滚轮缩放</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 map = new ol.Map({
    target: 'map',
    interactions: ol.interaction.defaults.defaults({
      dragPan: false,
      mouseWheelZoom: false
    }).extend([
      new ol.interaction.DragPan({
        condition: function (event) {
          return this.getPointerCount() === 2 ||
            ol.events.condition.platformModifierKeyOnly(event);
        }
      }),
      new ol.interaction.MouseWheelZoom({
        condition: ol.events.condition.platformModifierKeyOnly
      })
    ]),
    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: ol.proj.fromLonLat([116.391, 39.907]),
      zoom: 10
    })
  });

  map.getTargetElement().addEventListener('wheel', function (evt) {
    if (!evt.ctrlKey && !evt.metaKey) {
      evt.stopPropagation();
    }
  }, {passive: true});

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