modal里面使用mui-table-view 无法滚动？

<div id="modal" class="mui-modal"  style="overflow-y: scroll;">  
                <header class="mui-bar mui-bar-nav">  
                    <a class="mui-icon mui-icon-close mui-pull-right" href="#modal"></a>  
                    <h1 class="mui-title">Modal</h1>  
                </header>  
                <div class="mui-content">  
                    <ul id="ulunpay" class="mui-table-view">  
                        <li class=" mui-table-view-cell ">  
                            测试测试测试测试测试测试测试测试测试测试  
                            <div class="mui-table-view-chevron ">  
                                <button type="button " class="mui-btn mui-btn-blue mui-pull-right " onclick="cancleorder( 'orderid') ">取消订单</button>  
                            </div>  
                        </li><li class=" mui-table-view-cell ">  
                            测试测试测试测试测试测试测试测试测试测试  
                            <div class="mui-table-view-chevron ">  
                                <button type="button " class="mui-btn mui-btn-blue mui-pull-right " onclick="cancleorder( 'orderid') ">取消订单</button>  
                            </div>  
                        </li><li class=" mui-table-view-cell ">  
                            测试测试测试测试测试测试测试测试测试测试  
                            <div class="mui-table-view-chevron ">  
                                <button type="button " class="mui-btn mui-btn-blue mui-pull-right " onclick="cancleorder( 'orderid') ">取消订单</button>  
                            </div>  
                        </li>  
                        <li class="mui-table-view-cell ">  
                            测试测试测试<br />测试测试测试测试测试测试测试  
                            <div class="mui-table-view-chevron ">  
                                <button type="button " class="mui-btn mui-btn-green mui-pull-right " onclick="okorder( 'orderid') ">确认订单</button>  
                            </div>  
                        </li>  
                        <li class="mui-table-view-cell ">  
                            测试测试测试<br />测试测试测试测试测试测试测试  
                            <div class="mui-table-view-chevron ">  
                                <button type="button " class="mui-btn mui-btn-green mui-pull-right " onclick="okorder( 'orderid') ">确认订单</button>  
                            </div>  
                        </li>  
                        <li class="mui-table-view-cell ">  
                            测试测试测试<br />测试测试测试测试测试测试测试  
                            <div class="mui-table-view-chevron ">  
                                <button type="button " class="mui-btn mui-btn-green mui-pull-right " onclick="okorder( 'orderid') ">确认订单</button>  
                            </div>  
                        </li>  
                        <li class="mui-table-view-cell ">  
                            测试测试测试<br />测试测试测试测试测试测试测试  
                            <div class="mui-table-view-chevron ">  
                                <button type="button " class="mui-btn mui-btn-green mui-pull-right " onclick="okorder( 'orderid') ">确认订单</button>  
                            </div>  
                        </li>  
                        <li class="mui-table-view-cell ">  
                            测试测试测试<br />测试测试测试测试测试测试测试  
                            <div class="mui-table-view-chevron ">  
                                <button type="button " class="mui-btn mui-btn-green mui-pull-right " onclick="okorder( 'orderid') ">确认订单</button>  
                            </div>  
                        </li>  
                    </ul>  
                    <button class="mui-btn mui-btn-primary mui-btn-block" onclick="">确认订单</button>  
                </div>  
            </div>