引导导航栏高度增加了崩溃

Question

我是新来引导和有问题保持的line-height倒塌这些页眉和页脚的导航栏时...

<nav class="navbar navbar-fixed-top navbar-inverse"> 
     <div class="container-fluid no-padding"> 

<!-- header navbar --> 
<div class="navbar-header"> 
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar" style = "line-height: 30px;"> 
      <span class="sr-only">Toggle navigation</span> 
      <span class="glyphicon glyphicon-menu-hamburger"></span> 
      </button> 
      <a href="#" class="pull-left"> 
      <img height="35px;" src="image/companyLogo.png" style="margin-left: 5px;"> 
      </a> 
     <a class="navbar-brand" href="#" style = "line-height: 30px; margin-left: 1px;">Company Name</a> 
</div> 

<!-- footer navbar --> 
<div class="nav navbar-default navbar-fixed-bottom" style="background-color: #ADD6FF; font-size: 11px;"> 
      <ul class="nav navbar-nav" style = "float:right;"> 
      <li><a href="#">Copyright &#169; 2015</a></li> 
      </ul> 
</div> 

有了这些CSS覆盖...

.navbar-nav li a { 
line-height: 20px; 
} 

.navbar-header { 
line-height: 30px; 
} 

发生什么事情是，无论我设置的CSS，当页面崩溃时，它们总是增加（从外观约5-10像素）。所以我一直在寻找通过默认的引导程序的CSS文件的某种填充变量，这是在崩溃时添加的，但我找不到任何东西。

任何想法，我可能会在这里做错吗？即使是一个更好的方式来尝试和隔离问题的一般想法？我还应该补充一点，我下载了30px导航栏高度的自定义引导版本。

感谢您的任何想法！

Answer 1

行高问题并不是切换本身，它被替换为一个Glyphicon，使得当你在768px以下时导航栏被压下。

至于其他元件被重新定位（如图像），这是因为你与其中图像被放置在集管内以及沿除去从container-fluid的填充。这些在默认情况下都会改变视口，所以如果你不考虑它们，它可能会变得混乱。

也有CSS规则似乎是重复/冗余，所以也有一些冲突（或没有达到正确的选择器）。看例子。

html { 
 
    position: relative; 
 
    min-height: 100%; 
 
} 
 
body, 
 
html { 
 
    margin-top: 125px; 
 
    margin-bottom: 50px; 
 
} 
 
.footer { 
 
    vertical-align: center; 
 
    position: absolute; 
 
    bottom: 0; 
 
    width: 100%; 
 
    height: 50px; 
 
    background-color: #ADD6FF; 
 
    padding: 12px 0; 
 
} 
 
ul.footer-nav > li { 
 
    margin-top: 5px; 
 
    list-style: none; 
 
    vertical-align: center; 
 
    text-align: right; 
 
} 
 
ul.footer-nav > li > a { 
 
    text-decoration: none; 
 
    color: #444444; 
 
} 
 
.navbar.navbar-custom { 
 
    border-radius: 0px; 
 
    background: #33CC33; 
 
    border: 1px solid #FFFFFF; 
 
} 
 
.navbar-custom .navbar-nav > li > a { 
 
    color: #fff; 
 
} 
 
.navbar-custom .navbar-brand { 
 
    color: #fff; 
 
} 
 
.navbar-custom .navbar-logo { 
 
    float: left; 
 
    margin-left: 15px; 
 
} 
 
.navbar-custom .navbar-header .navbar-toggle { 
 
    background: none; 
 
    border: none; 
 
    line-height: 20px; 
 
    padding-bottom: 0; 
 
} 
 
.navbar-custom .navbar-header .navbar-toggle:hover, 
 
.navbar-custom .navbar-header .navbar-toggle:focus { 
 
    background: none; 
 
    border: none; 
 
} 
 
.navbar-custom .navbar-header .navbar-toggle .glyphicon-menu-hamburger, 
 
.navbar-custom .navbar-header .navbar-toggle .glyphicon-menu-hamburger:hover, 
 
.navbar-custom .navbar-toggle .navbar-header .glyphicon-menu-hamburger:focus { 
 
    color: #F0C425; 
 
} 
 
.navbar-custom .navbar-header .navbar-toggle .navbar-custom .navbar-right { 
 
    margin-right: 15px; 
 
} 
 
.navbar-default .lower-nav { 
 
    border: none; 
 
    border-radius: 0px; 
 
    background: #ADD6FF; 
 
    border: none; 
 
    margin-bottom: 0; 
 
} 
 
.navbar-default .lower-nav .nav-buttons { 
 
    margin: 5px 10px; 
 
    top: 5px; 
 
    border-radius border-radius: 0px; 
 
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> 
 
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script> 
 
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet" /> 
 
<div class="container-fluid"> 
 
    <nav class="navbar navbar-default navbar-custom navbar-fixed-top" role="navigation"> 
 
    <div class="navbar-header"> 
 
     <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-navbar"> <span class="sr-only">Toggle navigation</span> 
 
     <span class="glyphicon glyphicon-menu-hamburger"></span> 
 

 
     </button> 
 
     <a class="navbar-logo" href="#"> 
 
     <img src="http://placehold.it/100x50/ff0/ff0"> 
 
     </a><a class="navbar-brand" href="#">Brand</a> 
 

 
    </div> 
 
    <div class="collapse navbar-collapse" id="bs-navbar"> 
 
     <ul class="nav navbar-nav"> 
 
     <li><a href="#">Home</a> 
 

 
     </li> 
 
     <li><a href="#">About</a> 
 

 
     </li> 
 
     <li><a href="#">Contact</a> 
 

 
     </li> 
 
     </ul> 
 
    </div> 
 
    <nav class="navbar navbar-default lower-nav" role="navigation"> 
 
     <div class="btn-group pull-left"> 
 
     <div class="btn btn-link nav-buttons"><span class="glyphicon glyphicon-search"></span> 
 

 
     </div> 
 
     <div class="btn btn-link nav-buttons"><span class="glyphicon glyphicon-cloud"></span> 
 

 
     </div> 
 
     <div class="btn btn-link nav-buttons"><span class="glyphicon glyphicon-th"></span> 
 

 
     </div> 
 
     </div> 
 
    </nav> 
 
    </nav> 
 
</div> 
 
<div class="container"> 
 
    <div class="alert alert-info"> <a href="http://getbootstrap.com//">Bootstrap 3</a> 
 
    </div> 
 
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras ultrices enim id tortor tincidunt, eget mollis mauris gravida. Mauris sem leo, feugiat ut felis blandit, imperdiet egestas orci. Proin lacinia at massa fermentum facilisis. Donec laoreet 
 
    facilisis nunc, sed posuere magna rhoncus sed. Interdum et malesuada fames ac ante ipsum primis in faucibus. Praesent augue ipsum, rhoncus vel tempus sed, vehicula non purus. Nunc sit amet consectetur risus. Integer eget justo ut sapien consectetur 
 
    auctor id eu augue. Quisque ac elit congue, eleifend lectus a, tempor purus. In hac habitasse platea dictumst. Phasellus gravida massa arcu, sed sodales orci interdum vel. Curabitur ullamcorper leo mauris, ut interdum felis mollis id. Nunc porttitor 
 
    egestas fringilla. Suspendisse volutpat sem quis sagittis fermentum. Fusce in laoreet elit. Etiam aliquam varius tincidunt.</p> 
 
    <p>Nunc nisi justo, ultricies at lobortis et, fermentum at dolor. Nulla ultrices erat et erat egestas, in luctus justo pellentesque. In convallis purus ut pellentesque interdum. Curabitur in neque lectus. Nullam lobortis sodales elit, eu fringilla eros 
 
    aliquet vel. Aliquam ac ipsum vel nunc vestibulum luctus nec sit amet mauris. Ut viverra ornare risus eu condimentum. Fusce sollicitudin volutpat nisl id dignissim. Sed malesuada dui at magna imperdiet, non accumsan odio imperdiet. Etiam tristique 
 
    fermentum enim, vel dictum nulla fermentum ac. Etiam in bibendum nisi. Vestibulum neque lectus, vehicula eu sagittis ut, blandit sit amet mi.</p> 
 
    <p>Maecenas lacinia vestibulum magna. Integer mollis varius ullamcorper. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Nullam sit amet tortor turpis. Cras pharetra tellus elit, nec iaculis erat pellentesque 
 
    sit amet. Nullam varius felis vel velit fermentum, nec facilisis erat accumsan. Nullam facilisis orci quam, eget semper turpis dictum id. Aenean magna ante, lobortis id sollicitudin quis, dapibus nec nisi. Maecenas aliquet posuere lectus, a ultricies 
 
    arcu sodales sodales. Proin dignissim facilisis consectetur. Pellentesque suscipit quis dui eget malesuada. Quisque cursus neque a faucibus egestas. Phasellus sed nulla scelerisque diam adipiscing suscipit. Etiam sit amet enim ultricies risus consequat 
 
    vestibulum eu sit amet urna.</p> 
 
    <p>Vivamus hendrerit eget augue viverra auctor. Praesent mi leo, facilisis vel nisi vitae, sodales rhoncus augue. Maecenas purus nunc, commodo at massa eu, blandit aliquet enim. Proin sem neque, imperdiet non arcu eu, sagittis malesuada est. Fusce enim 
 
    neque, facilisis et mattis ut, vulputate sed justo. Vivamus elementum elit nunc, eget tempor erat adipiscing nec. Praesent vestibulum dapibus vehicula. Pellentesque viverra faucibus leo in ornare. Sed sodales faucibus tincidunt. Vivamus dignissim 
 
    tristique libero sit amet aliquet. Donec ut nunc dolor. Duis molestie tortor mi, id auctor nisi ullamcorper et. Proin eu ante cursus, varius felis id, porta orci.</p> 
 
    <p>Aliquam imperdiet scelerisque purus, nec sagittis mi auctor vitae. Maecenas sodales scelerisque massa, vitae iaculis neque tincidunt sed. Vivamus id imperdiet lectus. Fusce id tellus ut tellus volutpat hendrerit in at justo. Duis eu tempus nibh. Nunc 
 
    consectetur euismod sapien, eget placerat metus tempor sit amet. Maecenas at sem ac purus dictum viverra. Praesent eu neque in metus congue dictum eu in dolor. Mauris a elit sem. Quisque non velit malesuada ligula aliquet lacinia. Donec congue, leo 
 
    lacinia vulputate pulvinar, est justo venenatis nisi, sit amet condimentum massa sem sed urna. Duis eget pretium eros. Sed et rutrum leo, sit amet sollicitudin urna. Nullam dui augue, malesuada sed lectus sed, malesuada fringilla massa.</p> 
 
    <div class="alert alert-danger"> <a href="#">Start the Footer</a> 
 
    </div> 
 
</div> 
 
<footer class="footer"> 
 
    <div class="container"> 
 
    <ul class="footer-nav"> 
 
     <li><a href="#">Copyright &#169; 2015</a> 
 

 
     </li> 
 
    </ul> 
 
    </div> 
 
</footer>

Answer 2

.navbar-toggle变得可见，它的大小和边距导致.navbar增长。

在codepen .navbar-header是风格类似：

@media (min-width: 768px) 
{ 
    margin-right: 0; 
    margin-left: 0; 
} 

.navbar-header 
{ 
    margin-right: -15px; 
    margin-left: -15px; 
} 

这是造成标志移动。