如何为单个mapbox标记设置标签

mapboxgl.accessToken = 'YOUR_ACCESS_TOKEN';
var map = new mapboxgl.Map({
  container: 'map',
  style: 'mapbox://styles/mapbox/streets-v11',
  center: [longitude, latitude],
  zoom: 12
});

var marker = new mapboxgl.Marker()
  .setLngLat([longitude, latitude])
  .addTo(map);

var popup = new mapboxgl.Popup({ offset: 25 })
  .setText('标签内容');
marker.setPopup(popup);

marker.getElement().addEventListener('click', function() {
  marker.togglePopup();
});