javascript - Add a marker to an embedded google map? -

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i'm having hard time adding marker map. used use map engine , embed maps option has become limited in new maps. managed embed map new design using function, haven't been able manage add red marker it. code:

  function initialize() {     var map_canvas = document.getelementbyid('map_canvas');     var map_options = {         center: new google.maps.latlng(-34.443809, -58.866677),         zoom: 14,         maptypeid: google.maps.maptypeid.roadmap     };     var map = new google.maps.map(map_canvas, map_options);   }   google.maps.event.adddomlistener(window, 'load', initialize);

i think add marker must this:

    var i=new google.maps.marker({         position:new google.maps.latlng(-34.443809,-58.866677),         map:map_canvas         })

but can't figure out how documentation. how can add marker middle of map?

function initialize() {     var map_canvas = document.getelementbyid('map_canvas');     var map_options = {         center: new google.maps.latlng(-34.443809, -58.866677),         zoom: 14,         maptypeid: google.maps.maptypeid.roadmap     };     var map = new google.maps.map(map_canvas, map_options);     var i=new google.maps.marker({         position:new google.maps.latlng(-34.443809,-58.866677),         map:map // <------------------ needs google.maps.map object         })   }   google.maps.event.adddomlistener(window, 'load', initialize);

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