maptalks - 在Canvas容器中加载

在Canvas容器中加载
index.html
<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>地图 - 在Canvas容器中加载</title>
  <style type="text/css">
    html,body{margin:0px;height:100%;width:100%}
  </style>
  <link rel="stylesheet" href="https://unpkg.com/maptalks/dist/maptalks.css">
  <script type="text/javascript" src="https://unpkg.com/maptalks/dist/maptalks.min.js"></script>
  <body>

    <canvas width=600 height=300 id="map" style="border:1px solid"></canvas>

    <script>
      var res = (window.devicePixelRatio || (window.screen.deviceXDPI / window.screen.logicalXDPI)) > 1;
      if (res) {
        // retina, see https://developer.mozilla.org/en-US/docs/Web/API/Window/devicePixelRatio
        var canvas = document.getElementById('map');
        var r = 2;
        canvas.width *= r;
        canvas.height *= r;
        canvas.style.cssText += 'width:' + Math.round(canvas.width / r) + 'px;height:' + Math.round(canvas.height / r) + 'px';
      }

      var map = new maptalks.Map('map', {
        center: [-0.113049,51.498568],
        zoom: 14,
        zoomControl : true, // ignored in a canvas container
        scaleControl : true, // ignored in a canvas container
        baseLayer: new maptalks.TileLayer('base', {
          urlTemplate: 'https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png',
          subdomains: ['a','b','c','d'],
          attribution: '&copy; <a href="http://osm.org">OpenStreetMap</a> contributors, &copy; <a href="https://carto.com/">CARTO</a>'
        })
      });

    </script>
  </body>
</html>