如何从google maps Marker获取视图？

<script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=places"></script>

var map = new google.maps.Map(document.getElementById('map'), {
  center: {lat: 37.7749, lng: -122.4194},
  zoom: 12
});

var marker = new google.maps.Marker({
  position: {lat: 37.7749, lng: -122.4194},
  map: map,
  title: 'Marker Title'
});

var map = marker.getMap();

var icon = marker.getIcon();