Fitbunds没有定时器就不能工作[关闭]

当我试图删除fitbunds周围的setTimeout时,智能变焦将停止工作。我知道Google Maps API大多是异步的,这就是计时器让我的代码工作的原因。我已经找了几个小时,没有找到任何解决办法来删除这个计时器。有人能帮我吗?

var map;
var markers = [];
var bounds;

//Initialise google map
function initMap() {
    geocoder = new google.maps.Geocoder();
    var latlng = new google.maps.LatLng(46.950324, -71.256578);
    var mapOptions = {
      zoom: 7,
      center: latlng,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    }
    map = new google.maps.Map(document.getElementById('map'), mapOptions);
}

function filterSelection() { 
deleteMarkers();

for(...) {

    //Prends les informations de la compagnie
    var varlat = div[j].getAttribute('data-lat');
    var varlong = div[j].getAttribute('data-long');
    var nom = div[j].getAttribute('data-nom');
    var infowindow = new google.maps.InfoWindow({
          content: ""
    });

    if(varlat && varlong) {
        var maplatlong = new google.maps.LatLng(varlat, varlong);

        //Mets le point sur la carte
        var marker = new google.maps.Marker({
            map: map,
            position: maplatlong,
            title: nom,
            info: nom
        });

        //Pop up lorsqu'on clique sur le point
        marker.addListener('click', function() {
            infowindow.setContent( this.info );
            infowindow.open( map, this );
        });
        markers.push(marker);
        bounds.extend(maplatlong);
    }

}       

setTimeout(function(){ 
    if(markers.length > 0 ) {
        map.fitBounds(bounds); 

        google.maps.event.addListenerOnce(map, 'bounds_changed', function(event) {
        this.setZoom(map.getZoom()-1);
          if (this.getZoom() > 15) {
            this.setZoom(15);
          }
        });
    } else {
        map.setCenter(new google.maps.LatLng(46.950324, -71.256578));
    }
}, 3000);
}


// Deletes all markers in the array by removing references to them. AIzaSyATmzbLFTjqkr_vOKK1F8CIZ0cw1G0RNRA
function deleteMarkers() {
    for (var i = 0; i < markers.length; i++) {
      markers[i].setMap(null);
    }
    markers = [];
    bounds = new google.maps.LatLngBounds(null);
}