openlayer图层显示顺序

<!DOCTYPE html>
<html>
  <head>
    <title>Layer Z-Index</title>
    <link rel="stylesheet" href="http://openlayers.org/en/v3.13.0/css/ol.css" type="text/css">
    <script src="http://openlayers.org/en/v3.13.0/build/ol.js"></script>
  </head>
  <body>
    <div id="map" class="map"></div>
    <div>
      <label for="idx1">
        <input type="number" id="idx1"></input>
        Square layer Z-index
      </label></br>

      <label for="idx2">
        <input type="number" id="idx2"></input>
        Triangle layer Z-index
      </label>
    </div>
    <script>
      var stroke = new ol.style.Stroke({color: 'black',  1});

      var styles = {
        'square': new ol.style.Style({
          image: new ol.style.RegularShape({
            fill: new ol.style.Fill({color: 'blue'}),
            stroke: stroke,
            points: 4,
            radius: 80,
            angle: Math.PI / 4
          })
        }),
        'triangle': new ol.style.Style({
          image: new ol.style.RegularShape({
            fill: new ol.style.Fill({color: 'red'}),
            stroke: stroke,
            points: 3,
            radius: 80,
            rotation: Math.PI / 4,
            angle: 0
          })
        }),
        'star': new ol.style.Style({
          image: new ol.style.RegularShape({
            fill: new ol.style.Fill({color: 'green'}),
            stroke: stroke,
            points: 5,
            radius: 80,
            radius2: 4,
            angle: 0
          })
        })
      };


      function createLayer(coordinates, style, zIndex) {
        var feature = new ol.Feature(new ol.geom.Point(coordinates));
        feature.setStyle(style);

        var source = new ol.source.Vector({
          features: [feature]
        });

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

        return vectorLayer;
      }

      var layer0 = createLayer([40, 40], styles['star'], 0);
      var layer1 = createLayer([0, 0], styles['square'], 1);
      var layer2 = createLayer([0, 40], styles['triangle'], 0);

      var layers = [];
      layers.push(layer1);
      layers.push(layer2);

      var map = new ol.Map({
        layers: layers,
        target: 'map',
        view: new ol.View({
          center: [0, 0],
          zoom: 18
        })
      });

      layer0.setMap(map);


      function bindInputs(id, layer) {
        var idxInput = document.getElementById('idx' + id);
        idxInput.onchange = function() {
          layer.setZIndex(parseInt(this.value, 10) || 0);
        };
        idxInput.value = String(layer.getZIndex());
      }
      bindInputs(1, layer1);
      bindInputs(2, layer2);
    </script>
  </body>
</html>
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原文地址：https://www.cnblogs.com/devgis/p/16377257.html