Simple click event

HTML

<div id="map"></div>
 <!-- Replace the value of the key parameter with your own API key. -->
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap">
</script>

CSS

/* Always set the map height explicitly to define the size of the div
 * element that contains the map. */
#map {
  height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}

JavaScript

function initMap() {
  var myLatlng = {lat: -25.363, lng: 131.044};

  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 13,
    center: myLatlng
  });
  
  for (var j = 0; j < 12; j++){
		myLatlng.lat += 0.001;
    var marker = new google.maps.Marker({
      position: myLatlng,
      map: map,
      title: 'Click to zoom',
      content: j,
    });
    
    
    google.maps.event.addListener(marker, 'click', function() {
    console.log(this.content);
 	 });
  
  }

}