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我正在设计顶部导航栏的样式，但看不到如何删除下拉面板上的顶部插入符号（请参见下图）。如果您能提供帮助，请告诉我。谢谢
您可以通过像这样覆盖 Bootstrap CSS 来删除它。
/* remove the triangle */ .navbar .nav>li>.dropdown-menu:before,.navbar .nav>li>.dropdown-menu:after { content: none; }
工作示例：http ://bootply.com/66576
