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：

rush:xhtml;">

Box="0 0 24 24" x="0px" y="0px" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">

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;
}