BootStrap导航栏问题记录

今天完成的事情：（实现了test9的响应式导航栏的垂直平分和下拉列表的居中问题。）

我觉得最麻烦的就是要在bootstrap的格式下修改。我弄了好多次demo来虐导航栏。但是一直都没有头绪。知道昨晚在完玩狼人杀后，突然灵机一闪。

能不能通过内部的固定高度，来实现垂直平分的效果呢。

在查看psd图的效果是导航栏的a是垂直平分的。

那么我可否通过固定a超链接的高度来实现垂直平分呢？

<div "h-nav">
  <nav "container navbar navbar-default" role="navigation">
    <div "row">
      <div "navbar-header df-jcsbc">
        <a "navbar-brand" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
          <img src="img/test8-1/logo6.png" "">
        </a>
        <button type="button" " navbar-toggle" data-toggle="collapse" data-target="#navbar-collapse">
          <span "sr-only">切换导航</span>
          <span "icon-bar"></span>
          <span "icon-bar"></span>
          <span "icon-bar"></span>
        </button>
      </div>
      <div "collapse navbar-collapse" id="navbar-collapse">
        <ul id="h-cell-1" "nav navbar-nav lsno navbar-right">
          <li ""><a href="test9-1.html" rel="external nofollow" >首页</a></li>
          <li ""><a href="test9-3.html" rel="external nofollow" ><span "dib">职业</span></a></li>
          <li ""><a href="test9-2.html" rel="external nofollow" rel="external nofollow" ><span "dib pat">推荐</span></a></li>
          <li ""><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><span "dib pat">关于</span></a></li>
        </ul>
      </div>
    </div>
  </nav>
</div>

带着这种想法，我设定了如下属性。

#h-cell-1 a{
  display:inline-block;
  height:97px;
  margin-left:32px;
  font-size:17.8px;
  text-decoration: none;color:white;
}

为此怎么实现垂直居中呢？

第一点想到的是position定位了

既然要实现相对于a超链接的position，那么必须引入一个span盒子了。

<li ""><a href="test9-2.html" rel="external nofollow" rel="external nofollow" ><span "dib pat">推荐</span></a></li>

然后增加

#h-cell-1 li{height:97px;}
#h-cell-1 a{
  display:inline-block;
  position:relative;
  width:40px;
  height:97px;
  margin-left:32px;
  border-bottom:2px solid #20B176;
  font-size:17.8px;
  text-decoration: none;color:white;
}
#h-cell-1 a span{width:40px;}

@media only screen and (max-width: 700px) {
#h-cell-1 li{height:auto;}
#h-cell-1 a{height:20px;width:100%;margin:0;padding:0;overflow:hidden;}
#h-cell-1 a span{height:auto;}
}

ok，完美。

但是还有问题啊！

图标，和按钮原本是不垂直居中的啊！那这个怎么搞！

<div "navbar-header df-jcsbc">
  <a "navbar-brand" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
    <img src="img/test8-1/logo6.png" "">
  </a>
  <button type="button" " navbar-toggle" data-toggle="collapse" data-target="#navbar-collapse">
    <span "sr-only">切换导航</span>
    <span "icon-bar"></span>
    <span "icon-bar"></span>
    <span "icon-bar"></span>
  </button>
</div>

.df-jcsbc{display:flex;justify-content: space-between;align-items: center;}

.navbar-header{position: relative;height:97px;}
.navbar-brand{
padding:0;

  }
.navbar-header img{position:absolute;
  left:20px;}
.navbar-header button{position:absolute;
  margin:0;
  right:20px;}