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当我直接从ESRI Leaflet 网页获取此代码并将其放入JSFiddle 时，效果很好。ArcGIS 服务器中的所有图层都会显示出来。

但是，当我将这个确切的代码粘贴到文本文件中并用它制作一个 HTML 页面时，然后用 Chrome、Explorer 等打开它。没有任何经过身份验证的 ArcGIS 图层出现，只有底图。为什么会这样？

    <html>
<head>
  <meta charset="utf-8" />
  <title>ArcGIS Server username/password</title>
  <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />

  <!-- Load Leaflet from CDN -->
  <link rel="stylesheet" href="https://unpkg.com/leaflet@1.6.0/dist/leaflet.css"
  integrity="sha512-xwE/Az9zrjBIphAcBb3F6JVqxf46+CDLwfLMHloNu6KEQCAWi6HcDUbeOfBIptF7tcCzusKFjFw2yuvEpDL9wQ=="
  crossorigin=""/>
  <script src="https://unpkg.com/leaflet@1.6.0/dist/leaflet.js"
  integrity="sha512-gZwIG9x3wUXg2hdXF6+rVkLF/0Vi9U8D2Ntg4Ga5I5BZpVkVxlJWbSQtXPSiUTtC0TjtGOmxa1AJPuV0CPthew=="
  crossorigin=""></script>


  <!-- Load Esri Leaflet from CDN -->
  <script src="https://unpkg.com/esri-leaflet@2.4.1/dist/esri-leaflet.js"
  integrity="sha512-xY2smLIHKirD03vHKDJ2u4pqeHA7OQZZ27EjtqmuhDguxiUvdsOuXMwkg16PQrm9cgTmXtoxA6kwr8KBy3cdcw=="
  crossorigin=""></script>





  <style>
    body { margin:0; padding:0; }
    #map { position: absolute; top:0; bottom:0; right:0; left:0; }
  </style>
</head>
<body>

<div id="map"></div>

<script>
  // workaround for old ie
  if (!window.location.origin) {
    window.location.origin = window.location.protocol + '//' + window.location.hostname + (window.location.port ? ':' + window.location.port : '');
  }

  var map = L.map('map').setView([34.089, -116.865], 9);
  L.esri.basemapLayer('Topographic').addTo(map);

  function serverAuth (callback) {
    L.esri.post('https://sampleserver6.arcgisonline.com/arcgis/tokens/generateToken', {
      username: 'user1',
      password: 'user1',
      f: 'json',
      expiration: 86400,
      client: 'referer',
      referer: window.location.origin
    }, callback);
  }

  serverAuth(function (error, response) {
    if (error) {
      return;
    }

    var dl = L.esri.dynamicMapLayer({
      url: 'https://sampleserver6.arcgisonline.com/arcgis/rest/services/Wildfire_secure_ac/MapServer',
      opacity: 1,
      token: response.token
    }).addTo(map);

    dl.on('authenticationrequired', function (e) {
      serverAuth(function (error, response) {
        if (error) {
          return;
        }

        e.authenticate(response.token);
      });
    });
  });
</script>

</body>
</html>
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