问如何用单张图改变机群缩放水平？

EN

var markers = new L.LayerGroup(); //non cluster layer is added to map
markers.addTo(map);
var clusters = new L.MarkerClusterGroup (
    {
        disableClusteringAtZoom: 5,
        maxClusterRadius: 100,
        animateAddingMarkers: true
    }); //cluster layer is set and waiting to be used

var clusterStatus = 'no'; //since non cluster group is on by default, the status for cluster is set to no
 $('#mcluster').click(function( event ) {
    if(clusterStatus === 'no'){
        clusterStatus = 'yes';
        var current1 = markers.getLayers(); //get current layers in markers
        map.removeLayer(markers); // remove markers from map
        clusters.clearLayers(); // clear any layers in clusters just in case
        current1.forEach(function(item) {  //loop through the current layers and add them to clusters
            clusters.addLayer(item);
        });
        map.addLayer(clusters);
    } else {
        clusterStatus = 'no';  //we're turning off clustering here
        var current2 = clusters.getLayers(); //same code as before just reversed
        map.removeLayer(clusters);
        markers.clearLayers();
        current2.forEach(function(item) {
            markers.addLayer(item);
        });
        map.addLayer(markers);
    }
});

var mcg = L.markerClusterGroup().addTo(map),
    disableClusteringAtZoom = 2;

function changeClustering() {
    if (map.getZoom() >= disableClusteringAtZoom) {
        mcg.disableClustering(); // New method from sub-plugin.
    } else {
        mcg.enableClustering(); // New method from sub-plugin.
    }
}

map.on("zoomend", changeClustering);

$('#mcluster').click(function () {
    disableClusteringAtZoom = (disableClusteringAtZoom === 2) ? 5 : 2;
    changeClustering();
});

mcg.addLayers(arrayOfMarkers);

// Initially disabled, as if disableClusteringAtZoom option were at 2.
changeClustering();

// Use a timeout to trigger clustering after the zoom has ended,
// and make sure markers animate.
setTimeout(function () {
    mcg.enableClustering();
}, 0);