js实现哔哩哔哩侧边导航

2018年10月07日作者: 国瑞个人博客 403次浏览

相信大家对哔哩哔哩（B站），应该是在熟悉不过了，在它的右侧，可以点击快速跳转到某一个固定位置，每一个位置对应的都是相应的内容，接下来我们就来实现一下吧。

源码如下：

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<!DOCTYPE HTML>
<html>
<head>
<title>爱前端博客</title>
<meta charset="utf-8">
<meta name="Author" content="">
<style type='text/css'>
*{ margin:0; padding:0;}
div{
font-size:30px;
font-family:'Microsoft yahei';
font-weight:bold;
}
li{
list-style:none;
}

#header,#footer{
width:1300px;
height:800px;
background:#ffcccc;
margin:0 auto;
line-height:500px;
text-align:center;
}
#content{
width:1300px;
margin:0 auto;
position:relative;
}
#content div.nav{
width:1300px;
height:500px;

}
#slide{
width:50px;
height:500px;
border:1px solid #ddd;
border-radius:3px;
background:#e6f7f7;
float:right;
position:fixed;
top:230px;
}
#slide ul li.control{
width:50px;
height:32px;
line-height:32px;
text-align:center;
font-size:12px;
color:#000;
font-weight:normal;
cursor:pointer;
transition:0.2s;
position:relative;
z-index:2;
}
#slide ul li.blue{
background:#00A1D6;
width:50px;
height:32px;
position:absolute;
top:0px;
z-index:1;
display:none;
}
#slide ul li:hover{
background:#00A1D6;
color:#fff;
}
#slide ul li.on{
background:#00A1D6;
color:#fff;
}
#slide_wrap{
position:absolute;
right:-10px;
}

</style>
</head>
<body>

<div id="header">header</div>

<div id='content'>
<div class='nav' style="background-color:#33ffff">动画</div>
<div class='nav' style="background-color:#ff0066">音乐</div>
<div class='nav' style="background-color:#990099">舞蹈</div>
<div class='nav' style="background-color:#00ffff">番剧</div>
<div class='nav' style="background-color:#00ff33">科技</div>
<div class='nav' style="background-color:#66ff66">娱乐</div>
<div class='nav' style="background-color:#ff9966">鬼畜</div>
<div class='nav' style="background-color:#999966">电影</div>
<div class='nav' style="background-color:#cc9966">TV剧</div>
<div class='nav' style="background-color:#0000cc">直播</div>
<div class='nav' style="background-color:#330033">时尚</div>
<div class='nav' style="background-color:#cc00ff">游戏</div>
<div id="slide_wrap">
<div id='slide'>
<ul>
<li class="control">动画</li>
<li class="control">音乐</li>
<li class="control">舞蹈</li>
<li class="control">番剧</li>
<li class="control">科技</li>
<li class="control">娱乐</li>
<li class="control">鬼畜</li>
<li class="control">电影</li>
<li class="control">TV剧</li>
<li class="control">直播</li>
<li class="control">时尚</li>
<li class="control">游戏</li>
<li class="blue"></li>
</ul>
</div>
</div>
</div>

<div id="footer">footer</div>

<script type="text/javascript" src='jquery-1.12.1.min.js'></script>
<script type="text/javascript">

// 解决导航条定位问题
(function(){
var $content = $('#content');
var $slide = $('#slide');
var slideH = $slide.height();
var cOffsetTop = $content.offset().top;
var minus = ($(window).height() - slideH)/2;
minus = Math.max(0,minus);
$(window).resize(function(){
minus = ($(window).height() - slideH)/2;
minus = Math.max(0,minus);
$slide.css('top' , minus + 'px');
}).scroll(function(){
var scrollTop = $(document).scrollTop();
if ( scrollTop > 100 )
{
$slide.css('top' , minus + 'px');
}
else
{
$slide.css('top' , '230px');
}
});

})();

// 导航条操作
(function(){
var $slideLi = $('#slide ul li.control');
var $blue = $('#slide ul li.blue');
var $nav = $('#content .nav');
var length = $nav.length;
var index = 0;
var onOff = true;
$slideLi.click(function(){
onOff = false;
index = $(this).index();
$(this).addClass('on').siblings().removeClass('on');
var This = this;
var navOffsetTop = $nav.eq(index).offset().top;
//$(document).scrollTop(navOffsetTop);
//document.documentElement document.body
$('body,html').animate({
scrollTop : navOffsetTop
},500,function(){
onOff = true;
});
$blue.show().animate({
top : $(This).position().top + 'px',
},400,function(){
$(this).hide();
});
});

$(window).scroll(function(){
if ( onOff )
{
console.log(1);
var scrollTop = $(document).scrollTop();
for ( var i=0;i<length;i++ )
{
if ( scrollTop < $nav.eq(i).offset().top )
{
index = i - 1;
if ( index < 0 )
{
index = 0;
$slideLi.removeClass('on');
}else
{
$slideLi.eq(index).addClass('on').siblings().removeClass('on');
$blue.show().stop(true).animate({
top : $slideLi.eq(index).position().top + 'px',
},100,function(){
$(this).hide();
});
}
break;
}
}
}
});

})();
</script>

</body>
</html>