Bootstrap v3′snavigation has menus toggle enabled by default — you have to click to have them open/show, and click again to them shut (hide).
Wouldn’t it be nice to also have menus open through hovering your mouse over them?
It's a simple CSS addition.
Use the below CSS to have both toggling and hovering for menus.
.dropdown:hover .dropdown-menu {display: block;}
Told you it was simple!
原文：/support/tutorials-videos/202-how-to-enable-hover-for-nav-dropdowns
或者使用插件：
引用插件 bootstrap-hover-dropdown.min.js 后，Just adddata-hover="dropdown"where you'd putdata-toggle="dropdown"， 你也可以添加延迟 data-delay="1000"
原文：/demos/bootstrap-hover-dropdown/
下载插件：bootstrap-hover-dropdown-master
项目地址：/blog/bootstrap-dropdown-on-hover-plugin/
转自：Bootstrap mouseover 下拉菜单 Enable Hover for Bootstrap Nav Dropdowns
