在leaflet中创建cql过滤器

<link rel="stylesheet" href="https://unpkg.com/leaflet@1.7.1/dist/leaflet.css" />
<script src="https://unpkg.com/leaflet@1.7.1/dist/leaflet.js"></script>
<script src="https://unpkg.com/leaflet-cql-filter/dist/leaflet-cql-filter.min.js"></script>

var map = L.map('map').setView([51.505, -0.09], 13);
L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
    attribution: 'Map data &copy; <a href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors',
    maxZoom: 18
}).addTo(map);

var filter = new L.CQLFilter('population > 1000000');

var geojsonLayer = L.geoJSON(data, {
    filter: filter
}).addTo(map);