无论我做什么，我都无法显示切换导航按钮。导航栏折叠，但汉堡包图标没有显示 - 而是有一个小的半透明黑盒子，无法点击。
编辑：忘了提到Bootstrap和JQuery实际上都是在文档末尾加载的。
EDIT2：原来切换不起作用，因为我的路径错了（呃）。 但现在我仍然看不到汉堡包图标，只有一个小黑盒而不是它。
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