Delete Feature

<!--
  示例：删除要素
  要点：Select 多选集合逐个 removeFeature，删除后清空选中集合
  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>删除要素</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;font-size:12px;color:#58606e}
  .bar button{padding:4px 10px;border:1px solid #cfd4dc;border-radius:4px;
              background:#fff;cursor:pointer;font-size:12px}
  #map{flex:1 1 auto;min-height:0;background:#eef0f3}
</style>
</head>
<body>
<div class="bar">
  <span id="info">总数 8 · 选中 0</span>
  <button id="del">删除选中</button>
  <button id="restore">恢复全部</button>
  <span>Shift 点击可多选</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 points = [
    [116.3800, 39.9005, '西单'], [116.3912, 39.9074, '天安门'],
    [116.4106, 39.9147, '王府井'], [116.4200, 39.9220, '东四'],
    [116.3966, 39.9182, '景山'], [116.4068, 39.9040, '崇文门'],
    [116.3748, 39.9140, '复兴门'], [116.4130, 39.9088, '东单']
  ];

  var initial = points.map(function (p, i) {
    var f = new ol.Feature({
      geometry: new ol.geom.Point(ol.proj.fromLonLat([p[0], p[1]])),
      name: p[2]
    });
    f.setId('p' + i);
    return f;
  });

  var source = new ol.source.Vector({ features: initial.slice() });

  var layer = new ol.layer.Vector({
    source: source
  });

  layer.setStyle(function (feature) {
    return new ol.style.Style({
      image: new ol.style.Circle({
        radius: 7,
        fill: new ol.style.Fill({ color: '#1f5fd0' }),
        stroke: new ol.style.Stroke({ color: '#ffffff', width: 2 })
      }),
      text: new ol.style.Text({
        text: feature.get('name'),
        font: '500 11px sans-serif',
        offsetY: -14,
        fill: new ol.style.Fill({ color: '#16181d' }),
        stroke: new ol.style.Stroke({ color: '#ffffff', width: 3 })
      })
    });
  });

  var pickStyle = new ol.style.Style({
    image: new ol.style.Circle({
      radius: 9,
      fill: new ol.style.Fill({ color: '#c0392b' }),
      stroke: new ol.style.Stroke({ color: '#ffffff', width: 2 })
    })
  });

  var select = new ol.interaction.Select({
    multi: true,
    style: pickStyle
  });

  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'}) }), layer],
    view: new ol.View({
      center: ol.proj.fromLonLat([116.397, 39.911]),
      zoom: 14
    }),
    controls: ol.control.defaults.defaults({ attribution: false })
  });

  map.addInteraction(select);

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

  function report() {
    info.textContent = '总数 ' + source.getFeatures().length +
      ' · 选中 ' + select.getFeatures().getLength();
  }

  select.on('select', report);

  document.getElementById('del').addEventListener('click', function () {
    var chosen = select.getFeatures().getArray().slice();
    chosen.forEach(function (f) {
      source.removeFeature(f);
    });
    select.getFeatures().clear();
    report();
  });

  document.getElementById('restore').addEventListener('click', function () {
    source.clear();
    initial.forEach(function (f) {
      source.addFeature(f);
    });
    select.getFeatures().clear();
    report();
  });

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