Epsg 4326

<!--
  示例：EPSG:4326 视口 — OpenLayers epsg-4326
  核心逻辑：View 直接使用经纬度投影，坐标不再转 3857，瓦片由 OpenLayers 自动重投影
  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>EPSG:4326 视口</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}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3}
</style>
</head>
<body>
<div class="bar">
  <span>视口投影 EPSG:4326</span>
  <span id="mouse">—</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;
  }

  /* 视口投影改成 4326 后，中心点直接用经纬度，不需要 fromLonLat */
  var view = new ol.View({
    projection: 'EPSG:4326',
    center: [116.391263, 39.907359],
    zoom: 5,
    minZoom: 1,
    maxZoom: 16
  });

  var features = [
    [116.391263, 39.907359, '天安门'],
    [121.473700, 31.230400, '上海'],
    [113.264400, 23.129100, '广州']
  ].map(function (p) {
    return new ol.Feature({
      geometry: new ol.geom.Point([p[0], p[1]]),
      name: p[2]
    });
  });

  var style = function (feature) {
    return new ol.style.Style({
      image: new ol.style.Circle({
        radius: 5,
        fill: new ol.style.Fill({ color: '#c92a2a' }),
        stroke: new ol.style.Stroke({ color: '#ffffff', width: 2 })
      }),
      text: new ol.style.Text({
        text: feature.get('name'),
        offsetY: -13,
        font: '500 12px sans-serif',
        fill: new ol.style.Fill({ color: '#16181d' }),
        stroke: new ol.style.Stroke({ color: '#ffffff', width: 3 })
      })
    });
  };

  var map = new ol.Map({
    target: 'map',
    layers: [
      /* OSM 瓦片本身是 3857，视口是 4326，渲染时由 ol.reproj 逐块重投影 */
      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'}) }),
      new ol.layer.Vector({
        source: new ol.source.Vector({ features: features }),
        style: style
      })
    ],
    view: view,
    controls: ol.control.defaults.defaults({ attribution: false })
  });

  map.on('pointermove', function (evt) {
    var c = evt.coordinate;
    document.getElementById('mouse').textContent =
      c[0].toFixed(5) + '°, ' + c[1].toFixed(5) + '°';
  });
})();
</script>
</body>
</html>