      }

        .dropdown {
            position: absolute;
            right: 20px;
            top: 10px;
            z-index: 1000;
        }

        .dropdown-menu {
            min-width: 95px;
        }
    </style>
    <script>
        var map;
        var carmodel;
        var timestamp = 0,
            timeline;
        /** 地图初始化
         */
        function init() {
            //实例化Map对象加载地图
            map = new mapboxgl.Map({
                //地图容器div的id
