今天给大家分享一款基于jquery固定于顶部的导航，这款导航当浏览器滚动条位于顶部时，导航高度较高，当浏览器滚动向下滚动时，导航高度自动减低，并位于顶部。效果图如下：
实现的代码：
css代码：
<div class="jb51code">
<pre class="brush:css;">
html,body {
background: #fafafa;
color: #1BBBFB;
font-family: sans-serif;
}
page {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
}
toolbar {
display: block;
position: fixed;
width: 100%;
z-index: 10;
Box-sizing: border-Box;
-moz-Box-sizing: border-Box;
background-color: #1BBBFB;
padding: 0 16px;
}
actions {
position: relative;
display: flex;
align-items: center;
flex-direction: row;
height: 64px;
top: 0;
left: 0;
right 0;
}
actions .icon {
padding: 7px;
margin: 2px;
vertical-align: middle;
}
actions .spacer {
flex: 1;
}
actions svg {
display: inline-block;
pointer-events: none;
position: relative;
vertical-align: middle;
width: 24px;
height: 24px;
fill: #fff;
}
title {
padding: 21px;
position: absolute;
bottom: 0;
color: #fff;
}
content {
display: block;
position: relative;
padding: 24px;
}
.card {
display: block;
position: relative;
width: 60%;
height: 100px;
border: 1px solid #1BBBFB;
-webkit-border-radius: 4px;
-moz-border-radius: 4px;
border-radius: 4px;
background-color: #fff;
margin: 16px auto;
padding: 24px;
}
