 id="current-maps" >
    <div>
        <label>请选择地图类型:     </label>
        <select name="select-map" id="mapselecter">
            <option value="0" >现存确诊人数</option>
            <option value="1" >累计死亡人数</option>
            <option value="2" >死亡率（死亡/确诊）</option>
        </select>
    </div>
    <div>
        <label>拖动滑块即可切换日期:</label>
        <input id='slider' style="width: 400px;vertical-align: middle;" type='range' min='0' max=