问Google API热图层-可以显示在地图上的数据点的限制？

EN

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

        var map, heatmap;

  function initMap() {
    map = new google.maps.Map(document.getElementById('map'), {
      zoom: 2,
      center: {lat: 37.775, lng: -122.434},
    });

    heatmap = new google.maps.visualization.HeatmapLayer({
      data: getPoints(),
      map: map
    });
  }

  function getPoints() {

    var lotsOfMarkers = [];

    for( var i = 1; i <= 10000; i++) {

       var random = new google.maps.LatLng( (Math.random()*(85*2)-85), (Math.random()*(180*2)-180) );

        lotsOfMarkers.push(random);
    }

    return lotsOfMarkers;
  }
</script>
<script async defer src="https://maps.googleapis.com/maps/api/js?&libraries=visualization&callback=initMap">
</script>