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参考资料:
Bootstrap-submenu:http://www.html580.com/11848/demo
Bootstrap-submenu:https://vsn4ik.github.io/bootstrap-submenu/#html-examples
https://github.com/vsn4ik/bootstrap-submenu/issues:https://github.com/vsn4ik/bootstrap-submenu/issues
Hover效果:http://www.bootply.com/6FC76YQ4Nh#
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原文地址:http://www.cnblogs.com/junneyang/p/5667237.html