從bootstrap源碼來(lái)看：

.dropdown-menu-right?{
????right:?0;
????left:?auto
}

.dropdown-menu?{
????position:?absolute;
????top:?100%;
????left:?0;
????z-index:?1000;
????display:?none;
????float:?left;
????min-width:?160px;
????padding:?5px?0;
????margin:?2px?0?0;
????font-size:?14px;
????text-align:?left;
????list-style:?none;
????background-color:?#fff;
????-webkit-background-clip:?padding-box;
????background-clip:?padding-box;
????border:?1px?solid?#ccc;
????border:?1px?solid?rgba(0,0,0,.15);
????border-radius:?4px;
????-webkit-box-shadow:?0?6px?12px?rgba(0,0,0,.175);
????box-shadow:?0?6px?12px?rgba(0,0,0,.175)
}

只是把dropdown-menu右對(duì)齊（原本是左對(duì)齊），并不涉及與dropdown的對(duì)齊，如果你想對(duì)齊，還需要將dropdown上添加pull-right類名。? ? ? ??

當(dāng)然你如果只是涉及dropdown-menu文字右對(duì)齊，那么添加

.dropdown-menu{
text-align:right!important;
}

即可。