<div class="layui-inline">
    <label class="layui-form-label">访问平台</label>
    <div class="layui-input-block">
        <select name="platform" id="platform">
            <option value="">不限</option>
            <option value="android">android</option>
            <option value="ios">ios</option>
            <option value="wap">wap</option>
            <option value="pc">pc</option>
        </select>
    </div>
</div>