侧滑菜单官方说明文档缺少<div class="mui-off-canvas-backdrop"></div>

<!-- 侧滑导航根容器 -->
<div class="mui-off-canvas-wrap mui-draggable">
<!-- 菜单容器 -->
<aside class="mui-off-canvas-left">
<div class="mui-scroll-wrapper">
<div class="mui-scroll">
<!-- 菜单具体展示内容 -->
...
</div>
</div>
</aside>
<!-- 主页面容器 -->
<div class="mui-inner-wrap">
<!-- 主页面标题 -->
<header class="mui-bar mui-bar-nav">
<a class="mui-icon mui-action-menu mui-icon-bars mui-pull-left"></a>
<h1 class="mui-title">标题</h1>
</header>
<div class="mui-content mui-scroll-wrapper">
<div class="mui-scroll">
<!-- 主界面具体展示内容 -->
...
</div>
</div>

</div>
</div>

上面是官方说明文档的代码示例模板，在*****处 缺少 <div class="mui-off-canvas-backdrop"></div>