WHY MARKER IS NOT VISIBLE IN THE GOOGLE MAP WHICH IS IN THE WHILE LOOP OF THE CODE

[zaba...@gmail.com]

<script type="text/javascript" >

var latt=<?php echo json_encode($latt); ?>;
var long=<?php echo json_encode($long); ?>;

var k=<?php echo $up; ?>;

var map, infoWindow;
function initMap() {
map = new google.maps.Map(document.getElementById('map'), {
center: {lat: 20.5937, lng: 78.9629},
zoom: 7
});
infoWindow = new google.maps.InfoWindow;

// Try HTML5 geolocation.
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function(position) {
var pos = {
lat: position.coords.latitude,
lng: position.coords.longitude
};

var marker = new google.maps.Marker({
position: pos,
map: map
});


var n=0;

while(n!=k)
{
var hh = latt[n];
var hhh = long[n];
var p = {
lat: hh,
lng: hhh
};
var marker = new google.maps.Marker({
position: p,
map: map
});

n++;
}

map.setCenter(pos);
}, function() {
handleLocationError(true, infoWindow, map.getCenter());
});
} else {
// Browser doesn't support Geolocation
handleLocationError(false, infoWixndow, map.getCenter());
}
}

function handleLocationError(browserHasGeolocation, infoWindow, pos) {
infoWindow.setPosition(pos);
infoWindow.setContent(browserHasGeolocation ?
'Error: The Geolocation service failed.' :
'Error: Your browser doesn\'t support geolocation.');
infoWindow.open(map);
}
</script>