Animated Gif

<!--
  说明：逐帧动画图标的中文示例，数据在页面内生成，可独立运行。
  核心逻辑：canvas 多帧 toDataURL + setInterval 切换 ol.style.Icon
  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>逐帧动画图标</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 button{font:inherit;padding:3px 9px;border:1px solid #c9ced6;background:#fff;
       border-radius:5px;cursor:pointer;color:#333}
  .bar button:hover{background:#eef2f8}
  .bar input[type=range]{width:110px;vertical-align:middle}
  .bar input[type=text]{font:inherit;padding:2px 6px;border:1px solid #c9ced6;border-radius:4px}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3;position:relative}
  .panel{flex:0 0 auto;max-height:34%;overflow:auto;padding:8px 12px;font-size:12px;
       background:#fff;border-top:1px solid #e3e6ea;color:#3d4451}
  .panel pre{margin:0;font-family:Consolas,"Courier New",monospace;font-size:11px;
       white-space:pre-wrap;word-break:break-all;line-height:1.5}
  .ol-attribution{font-size:11px}

</style>
</head>
<body>
<div class="bar">
<label><input type="checkbox" id="play" checked> 播放动画</label>
<span id="info">帧 1 / 8</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') {
    var errBox = document.getElementById('map');
    if (errBox) {
      errBox.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 FS = 36;
  function frameUrl(i) {
    var c = document.createElement('canvas');
    c.width = c.height = FS;
    var ctx = c.getContext('2d');
    var phase = i / 8;
    ctx.clearRect(0, 0, FS, FS);
    ctx.strokeStyle = 'rgba(31,95,208,' + ((1 - phase) * 0.75).toFixed(3) + ')';
    ctx.lineWidth = 2;
    ctx.beginPath();
    ctx.arc(FS / 2, FS / 2, 7 + phase * 9, 0, Math.PI * 2);
    ctx.stroke();
    var r = 6 + 1.5 * Math.sin(phase * Math.PI * 2);
    ctx.beginPath();
    ctx.arc(FS / 2, FS / 2, r, 0, Math.PI * 2);
    ctx.fillStyle = '#1f5fd0';
    ctx.fill();
    ctx.lineWidth = 2;
    ctx.strokeStyle = '#ffffff';
    ctx.stroke();
    return c.toDataURL('image/png');
  }

  var icons = [];
  for (var i = 0; i < 8; i++) {
    icons.push(new ol.style.Icon({src: frameUrl(i)}));
  }

  var place = [
    [116.4074, 39.9042, '北京'],
    [121.4737, 31.2304, '上海'],
    [113.2644, 23.1291, '广州']
  ];
  var features = place.map(function (p) {
    return new ol.Feature({
      geometry: new ol.geom.Point(fromLonLat([p[0], p[1]])),
      name: p[2]
    });
  });

  /* 3 个要素 × 8 帧，样式预先缓存 */
  var cache = features.map(function (f) {
    var list = [];
    for (var k = 0; k < 8; k++) {
      list.push(new ol.style.Style({
        image: icons[k],
        text: new ol.style.Text({
          text: f.get('name'),
          offsetY: 24,
          font: '500 12px sans-serif',
          fill: new ol.style.Fill({color: '#16181d'}),
          stroke: new ol.style.Stroke({color: '#ffffff', width: 3})
        })
      }));
    }
    return list;
  });

  var view = new ol.View({center: fromLonLat([112.5, 32.5]), zoom: 4.5});
  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'})}),
      new ol.layer.Vector({source: new ol.source.Vector({features: features})})
    ],
    view: view,
    controls: ol.control.defaults.defaults({attribution: false, zoom: true, rotate: false})
  });

  var info = document.getElementById('info');
  var frame = 0;
  var timer = null;

  function apply() {
    features.forEach(function (f, i) { f.setStyle(cache[i][frame]); });
    info.textContent = '帧 ' + (frame + 1) + ' / 8';
  }

  function start() {
    if (timer) { return; }
    timer = setInterval(function () {
      frame = (frame + 1) % 8;
      apply();
    }, 120);
  }

  function stop() {
    clearInterval(timer);
    timer = null;
  }

  apply();
  start();

  document.getElementById('play').addEventListener('change', function () {
    if (this.checked) { start(); } else { stop(); }
  });
})();
</script>
</body>
</html>