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在 Bootstrap 4 中，通过基于便利性在内部或外部添加 CSS 属性，Navbar 中的全宽下拉列表是可能的。只关注类下拉菜单和下拉菜单。 首先聚焦下拉菜单的父类下拉菜单，然后使其在位置上保持静态，如下所示: 现在，使下拉菜单的上边距为零像素，宽度增加到 100%。