不知何故,在运行数月(AFAIK)后,我的汉堡包按钮已停止响应,并切换了下拉菜单。似乎很简单,我看不到有什么变化-如果有人发现错误,我将不胜感激:
<nav class="navbar navbar-toggleable-md navbar-expand-md" id="navbar">
<button class="navbar-toggler navbar-expand custom-toggler" type="button" data-toggle="collapse"
data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon custom-toggler navbar-toggler-icon-dark"></span>
</button>
<a class="navbar-brand" href="#"><img
是因为引导代码中没有内容吗?
.navbar-toggler-icon {
display: inline-block;
width: 1.5em;
height: 1.5em;
vertical-align: middle;
content: "";
background: no-repeat center center;
background-size: 100% 100%;
margin-left: 18px;
}
如有必要,我可以发布更多信息-预先感谢!