How to get only one marker in the Google Maps API with JavaScript -

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my code: 

<script src="http://maps.googleapis.com/maps/api/js"> </script>  <script> var map; var mycenter=new google.maps.latlng(51.508742,-0.120850);  function initialize() { var mapprop = {   center:mycenter,   zoom:5,   maptypeid:google.maps.maptypeid.roadmap   };    map = new google.maps.map(document.getelementbyid("googlemap"),mapprop);    google.maps.event.addlistener(map, 'click', function(event) {     placemarker(event.latlng);   }); }  function placemarker(location) {   var marker = new google.maps.marker({     position: location,     map: map,   });   var infowindow = new google.maps.infowindow({     content: 'latitude: ' + location.lat() + '<br>longitude: ' + location.lng()   });   infowindow.open(map,marker); }  google.maps.event.adddomlistener(window, 'load', initialize); </script> </head>  <body> <div id="googlemap" style="width:500px;height:380px;"></div>

ive got every klick new marker. how can remove other if click again?

btw: readed :google maps how show 1 marker?

wanted use it, doenst work (in console:tcurrentposition() , watchposition() deprecated on insecure origins, , support removed in future. should consider switching application secure origin, such https. see https://goo.gl/rsttgz more details.)

thank :)

one option if ever want 1 marker, create 1 , move required.

proof of concept fiddle

code snippet:

var map;  var mycenter = new google.maps.latlng(51.508742, -0.120850);  var marker;  var infowindow;    function initialize() {    var mapprop = {      center: mycenter,      zoom: 5,      maptypeid: google.maps.maptypeid.roadmap    };      map = new google.maps.map(document.getelementbyid("googlemap"), mapprop);      google.maps.event.addlistener(map, 'click', function(event) {      placemarker(event.latlng);    });  }    function placemarker(location) {    if (!marker || !marker.setposition) {      marker = new google.maps.marker({        position: location,        map: map,      });    } else {      marker.setposition(location);    }    if (!!infowindow && !!infowindow.close) {      infowindow.close();    }    infowindow = new google.maps.infowindow({      content: 'latitude: ' + location.lat() + '<br>longitude: ' + location.lng()    });    infowindow.open(map, marker);  }    google.maps.event.adddomlistener(window, 'load', initialize);
html,  body,  #googlemap {    height: 100%;    width: 100%;    margin: 0px;    padding: 0px  }
<script src="https://maps.googleapis.com/maps/api/js"></script>  <div id="googlemap"></div>


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