openlayers5之加载KML数据

功能说明

openlayers加载KML格式数据

//矢量图层，数据源为kml文件;
var vetorLayer=new ol.layer.Vector({
    source:new ol.source.Vector({
         url: 'data/kml/2012-02-10.kml',
         format:new ol.format.KML()
    });
})
//与其他矢量图层一样进行查询操作。
var displayFeatureInfo = function(pixel) {
        var features = [];
        map.forEachFeatureAtPixel(pixel, function(feature) {
          features.push(feature);
        });
        if (features.length > 0) {
          var info = [];
          var i, ii;
          for (i = 0, ii = features.length; i < ii; ++i) {
            info.push(features[i].get('name'));
          }
          document.getElementById('info').innerHTML = info.join(', ') || '(unknown)';
          map.getTarget().style.cursor = 'pointer';
        } else {
          document.getElementById('info').innerHTML = '&nbsp;';
          map.getTarget().style.cursor = '';
        }
      };
      map.on('pointermove', function(evt) {
        if (evt.dragging) {
          return;
        }
        var pixel = map.getEventPixel(evt.originalEvent);
        displayFeatureInfo(pixel);
      });
      map.on('click', function(evt) {
        displayFeatureInfo(evt.pixel);
      });