mui使用弹出菜单（popover）被遮蒙板遮住

错误示范

<div class = "mui-content">


		    <div id="popover" class="mui-popover">
		      <ul class="mui-table-view">
		        <li class="mui-table-view-cell"><a href="#">Item1</a></li>
		        <li class="mui-table-view-cell"><a href="#">Item2</a></li>
		      </ul>
		    </div>
	    
	    
	   	   <a href="#popover" id="openPopover" class="mui-btn mui-btn-primary mui-btn-block">打开弹出菜单</a>


</div>

然后你一点击, 菜单是出来的, 不过蒙着的

正确示范

<div class = "mui-content">
	    <a href="#popover" id="openPopover" class="mui-btn mui-btn-primary mui-btn-block">打开弹出菜单</a>
</div>



    <div id="popover" class="mui-popover">
      <ul class="mui-table-view">
        <li class="mui-table-view-cell"><a href="#">Item1</a></li>
        <li class="mui-table-view-cell"><a href="#">Item2</a></li>
      </ul>
    </div>

---

菜单被蒙着的原因是因为 <div id="popover" class="mui-popover">被放到了里面，只要把 <div id="popover" class="mui-popover">拿到<div class = "mui-content">的外面就可以了