<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>ADC</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap-theme.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
这是词缀代码： .affix { 顶部：0; 宽度：100％; } .navbar { border-width：0px; -webkit-box-shadow：0px 0px; box-shadow：0px 0px; background-color：rgba（0,0,0,0.0）; background-image：-webkit-gradient（线性，50.00％0.00％，50.00％100.00％，颜色停止（0％，rgba（0,0,0,0.00）），颜色停止（100％，rgba（0 ，0,0,0.00）））; background-image：-webkit-linear-gradient（270deg，rgba（0,0,0,0.00）0％，rgba（0,0,0,0.00）100％）; background-image：线性渐变（180deg，rgba（0,0,0,0.00）0％，rgba（0,0,0,0.00）100％）; } .navbar-default .navbar-nav＆gt; li>一个{ 颜色：黑色; } .navbar-default .navbar-nav＆gt; .dropdown＆gt; a .caret { border-top-color：#fff; border-bottom-color：#fff; } .navbar-default .navbar-brand { 颜色：黑色; } .menu-large { 位置：静态！重要; } .megamenu { 填充：20px 0px; 宽度：100％; 填充：0; 保证金：0; } .megamenu＆GT; li> ul { 填充：0; 保证金：0; } .megamenu＆GT; li> ul＆gt; li { list-style：none; } .megamenu＆GT; li> ul＆gt; li>一个 { 显示：块; 填充：3px 20px; 明确：两者; font-weight：normal; line-height：1.428571429; 颜色：＃333333; 白色空间：正常; } .megamenu＆GT; li ul> li>一个， .megamenu＆GT; li ul> li> a：焦点{ text-decoration：none; 颜色：＃262626; background-color：＃f5f5f5; }
.megamenu.disabled > a,
.megamenu.disabled > a,
.megamenu.disabled > a:focus {
color: #999999;
}
.megamenu.disabled > a,
.megamenu.disabled > a:focus {
text-decoration: none;
background-color: transparent;
background-image: none;
filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
cursor: not-allowed;
}
.megamenu.dropdown-header {
color: #428bca;
font-size: 18px;
}
@media (max-width: 768px) {
.megamenu{
margin-left: 0 ;
margin-right: 0 ;
}
.megamenu> li {
margin-bottom: 30px;
}
.megamenu> li:last-child {
margin-bottom: 0;
}
.megamenu.dropdown-header {
padding: 3px 15px !important;
}
.navbar-nav .open .dropdown-menu .dropdown-header{
color:#fff;
}
}
</style>
<script>
$(document).ready(function(){
$("#flip").click(function(){
$("#panel").slideToggle("slow");
});
$("#flip1").click(function(){
$("#panel1").slideToggle("slow");
});
});
</script>
</head>
<body>
<div class="navbar navbar-default">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Logo</a>
</div>
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li><a href="#">Home</a></li>
<li class="dropdown menu-large">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" id="flip1"> Product Listing <b class="caret"></b> </a>
<ul class="dropdown-menu megamenu row" data-spy="affix" data-offset-top="197" id="panel1">
<li>
<div class="col-sm-6 col-md-3">
<a href="#" class="thumbnail">
<img src="http://placehold.it/150x120" />
</a>
</div>
<div class="col-sm-6 col-md-3">
<a href="#" class="thumbnail">
<img src="http://placehold.it/150x120" />
</a>
</div>
<div class="col-sm-6 col-md-3">
<a href="#" class="thumbnail">
<img src="http://placehold.it/150x120" />
</a>
</div>
<div class="col-sm-6 col-md-3">
<a href="#" class="thumbnail">
<img src="http://placehold.it/150x120" />
</a>
</div>
</li>
</ul>
</li>
<li class="dropdown menu-large">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" id="flip">Categories <b class="caret"></b></a>
<ul class="dropdown-menu megamenu row" data-spy="affix" data-offset-top="197" id="panel">
<li class="col-sm-3">
<ul>
<li class="dropdown-header">Glyphicons</li>
<li><a href="#">Available glyphs</a></li>
<li class="disabled"><a href="#">How to use</a></li>
<li><a href="#">Examples</a></li>
<li class="divider"></li>
<li class="dropdown-header">Dropdowns</li>
<li><a href="#">Example</a></li>
<li><a href="#">Aligninment options</a></li>
<li><a href="#">Headers</a></li>
<li><a href="#">Disabled menu items</a></li>
</ul>
</li>
<li class="col-sm-3">
<ul>
<li class="dropdown-header">Button groups</li>
<li><a href="#">Basic example</a></li>
<li><a href="#">Button toolbar</a></li>
<li><a href="#">Sizing</a></li>
<li><a href="#">Nesting</a></li>
<li><a href="#">Vertical variation</a></li>
<li class="divider"></li>
<li class="dropdown-header">Button dropdowns</li>
<li><a href="#">Single button dropdowns</a></li>
</ul>
</li>
<li class="col-sm-3">
<ul>
<li class="dropdown-header">Input groups</li>
<li><a href="#">Basic example</a></li>
<li><a href="#">Sizing</a></li>
<li><a href="#">Checkboxes and radio addons</a></li>
<li class="divider"></li>
<li class="dropdown-header">Navs</li>
<li><a href="#">Tabs</a></li>
<li><a href="#">Pills</a></li>
<li><a href="#">Justified</a></li>
</ul>
</li>
<li class="col-sm-3">
<ul>
<li class="dropdown-header">Navbar</li>
<li><a href="#">Default navbar</a></li>
<li><a href="#">Buttons</a></li>
<li><a href="#">Text</a></li>
<li><a href="#">Non-nav links</a></li>
<li><a href="#">Component alignment</a></li>
<li><a href="#">Fixed to top</a></li>
<li><a href="#">Fixed to bottom</a></li>
<li><a href="#">Static top</a></li>
<li><a href="#">Inverted navbar</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
</div>
</div>
<h1>Responsive Mega Dropdown</h1>
<h2>Responsive Mega Dropdown</h2>
<br>
<h1>Responsive Mega Dropdown</h1>
<br>
<br>
<h1>Responsive Mega Dropdown</h1>
<br>
<h4>Responsive Mega Dropdown</h4>
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<h5>Responsive Mega Dropdown</h5>
<h1>Responsive Mega Dropdown</h1>
<h2>Responsive Mega Dropdown</h2>
<br>
<h1>Responsive Mega Dropdown</h1>
<br>
<br>
<h1>Responsive Mega Dropdown</h1>
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<h4>Responsive Mega Dropdown</h4>
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<h5>Responsive Mega Dropdown</h5>
<h1>Responsive Mega Dropdown</h1>
<h2>Responsive Mega Dropdown</h2>
<br>
<h1>Responsive Mega Dropdown</h1>
<br>
<br>
<h1>Responsive Mega Dropdown</h1>
<br>
<h4>Responsive Mega Dropdown</h4>
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<h5>Responsive Mega Dropdown</h5>
<h1>Responsive Mega Dropdown</h1>
<h2>Responsive Mega Dropdown</h2>
<br>
<h1>Responsive Mega Dropdown</h1>
<br>
<br>
<h1>Responsive Mega Dropdown</h1>
<br>
<h4>Responsive Mega Dropdown</h4>
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<h5>Responsive Mega Dropdown</h5>
</body>
</html>
答案 0 :(得分：1)
根据我在将代码加载到浏览器时能够看到的内容，我发现修复它的最简单方法是在您的词缀类中设置top: -1px，为您提供.affix { top: -1px; width: 100%; }。这告诉浏览器将元素定位在视口顶部之外一个像素，确保不存在间隙。
我希望我有一个明确的答案，为什么0px不起作用，因为我坚信它应该，但是使用-1px似乎可以解决它而不会在菜单中实际丢失任何空间。