加点聚合的功能怎么加，用官网示例的写法会报错

[peiyanmei]

    var MAX = 10;
    var markers = [];
    var pt = null;
    var i = 0;
    for (; i < MAX; i++) {
        pt = new BMap.Point(Math.random() * 40 + 85, Math.random() * 30 + 21);
        markers.push(new BMap.Marker(pt));
    }
    console.log(markers)
    //最简单的用法，生成一个marker数组，然后调用markerClusterer类即可。
    var markerClusterer = new BMapLib.MarkerClusterer(this.map, { markers: markers });

Uncaught TypeError: Cannot read properties of undefined (reading 'style')
at BMapLib.TextIconOverlay.e._updateCss (TextIconOverlay_min.js:1:7224)