maptalks - 用JSON复制Layer

用JSON复制Layer

index.html

<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>JSON序列化 - 用JSON复制Layer</title>
  <style type="text/css">
    html,body{margin:0px;height:100%;width:100%}
    .container{width:calc(50% - 2px);height:calc(100% - 2px);float:left;border:1px solid}
    #map1{width:calc(50% - 2px);height:calc(100% - 2px);float:right;border:1px solid}
  </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>

    <div id="map" class="container"></div>
    <div id="map1"></div>

    <script>
      var c = [-0.113049,51.498568];
      var map = new maptalks.Map('map', {
        center: c,
        zoom: 13,
        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>'
        }),
        layers : [
          new maptalks.VectorLayer('v0', [
            new maptalks.Marker(c)
          ]),
          new maptalks.VectorLayer('v1', [
            new maptalks.Rectangle(c, 1000, 800)
          ])
        ]
      });

      var map1 = new maptalks.Map('map1', {
        center: c,
        zoom: 13,
        baseLayer: new maptalks.TileLayer('base1', {
          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>'
        })
      });
      // copy layer by JSON
      maptalks.Layer.fromJSON(map.getLayer('v0').toJSON()).addTo(map1);

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

var c = [-0.113049, 51.498568];
var map = new maptalks.Map('map', {
  center: c,
  zoom: 13,
  baseLayer: new maptalks.TileLayer('base', {
    urlTemplate: 'https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png',
    subdomains: ['a', 'b', 'c', 'd'],
    attribution: '© <a href="http://osm.org">OpenStreetMap</a>  contributors, © <a href="https://carto.com/">CARTO</a> '
  }),
  layers: [
    new maptalks.VectorLayer('v0', [
      new maptalks.Marker(c)
    ]),
    new maptalks.VectorLayer('v1', [
      new maptalks.Rectangle(c, 1000, 800)
    ])
  ]
});

var map1 = new maptalks.Map('map1', {
  center: c,
  zoom: 13,
  baseLayer: new maptalks.TileLayer('base1', {
    urlTemplate: 'https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png',
    subdomains: ['a', 'b', 'c', 'd'],
    attribution: '© <a href="http://osm.org">OpenStreetMap</a>  contributors, © <a href="https://carto.com/">CARTO</a> '
  })
});
// copy layer by JSON
maptalks.Layer.fromJSON(map.getLayer('v0').toJSON()).addTo(map1);