google-maps-markers - コードで Google マップに複数のマーカーを読み込むのが困難です。私のコードでは、gmap に読み込まれるマーカーは 1 つだけです。解決策を教えてください。

Question

<script type="text/javascript">
    var map;
    var mc; //marker clusterer
    var mcOptions = { gridSize: 10, maxZoom: 8 };
    var infowindow = new google.maps.InfoWindow(); //global infowindow
    var geocoder = new google.maps.Geocoder(); //geocoder

    var address = new Array("15.8700, 74.5000", "15.871463, 74.500777", "15.871505, 74.500884", "32.7714,-97.2915");`enter code here`
    var content = new Array("Unit`enter code here`No1", "UnitNo42", "UnitNo43", "UnitNo44");

    //min and max limits for multiplier, for random numbers //keep the range pretty small, so markers are kept close by
    var min = .999999;
    var max = 1.000001;

    function createMarker(latlng, text) {

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

        ///get array of markers currently in cluster
        var allMarkers = mc.getMarkers();

        //check to see if any of the existing markers match the latlng of the new marker
        if (allMarkers.length != 0) {
            for (i = 0; i < allMarkers.length; i++) {
                var existingMarker = allMarkers[i];
                var pos = existingMarker.getPosition();

                if (latlng.equals(pos)) {
                    text = text + " & " + content[i];
                }
            }
        }
        // WHERE TO ADD: mc.addMarker(marker); //??

        google.maps.event.addListener(marker, 'click', function () {
            infowindow.close();
            infowindow.setContent(text);
            infowindow.open(map, marker);
        });
        return marker;
    }


    function initialize() {
        var options = {
            zoom: 2,
            center: new google.maps.LatLng(21.7679, 78.8718),
            mapTypeId: google.maps.MapTypeId.ROADMAP
        };
        map = new google.maps.Map(document.getElementById('map'), options);

        var gmarkers = [];
        for (i = 0; i < address.length; i++) {
            var ptStr = address[i];
            var coords = ptStr.split(",");
            var latlng = new google.maps.LatLng(parseFloat(coords[0]), parseFloat(coords[1]))
            gmarkers.push(createMarker(latlng, content[i]));
        }
        //marker cluster
        mc = new MarkerClusterer(map, gmarkers, mcOptions);
        for (i = 0; i < address.length; i++) {
            geocodeAddress(address[i], i);

        }
    }


</script>