javascript - Google maps - how to add marker without layout refresh -

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have problem marker adding.

        var marker = new google.maps.marker({         position: mylatlng,         title:"hello world!"     });      // add marker map, call setmap();     marker.setmap(map);

https://jsfiddle.net/73ogq84a/

simple example, each seconds put marker, page not reloading, reloading layout , see effect of map reload.

it possible put marker smoothly.

but on page http://www.flightradar24.com/simple_index.php working fine, planes flying , no effect of map reload.

make marker , map global. don't recreate map every time, move marker.

var map, marker, mylatlng;  setinterval(function () {     if (!marker || !marker.setposition) {         marker = new google.maps.marker({             position: mylatlng,             title: "hello world!"         });          // add marker map, call setmap();         marker.setmap(map);     } else {         marker.setposition(mylatlng);     }  }, 5000);

updated fiddle


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