当滚动条滚动到内容区域的时候，侧边导航条定位到屏幕，不再动，并且点击导航条跳转到内容所在的位置；
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<style>
*{
padding: 0;
margin: 0;
}
.left{
float: left;
padding: 0 0 328px 0;
}
.left p{
width: 800px;
height: 300px;
line-height: 300px;
text-align: center;
font-size: 30px;
background: gray;
margin: 10px 0;
}
.nav{
position: absolute;
right:20px;
top: 20px;
}
.nav p{
width: 100px;
height: 80px;
line-height: 80px;
text-align: center;
background: pink;
margin: 10px 0;
cursor: pointer;
}
.bottom{
overflow: hidden;
width: 100%;
position: relative;
}
</style>
<title>Document</title>
</head>
<body>
<img style="width:100%" src="o_1bsmo1kpn1hp61bm0176i1bk618uo9.jpg" alt="">
<p class="bottom">
<p class="left">
<p class="one leftp" id="one">
一
</p>
<p class="conOne leftp" id="two">
二
</p>
<p class="leftp" id="three ">
三
</p>
<p class="leftp" id="four">
四
</p>
</p>
<p class="nav">
<p class="one navp">one</p>
<p class="two navp">two</p>
<p class="three navp">three</p>
<p class="four navp">four</p>
</p>
</p>
<script src="jquery.js"></script>
<script>
$(window).scroll(function(e){
console.log($(window).scrollTop());
if ($(window).scrollTop() >$('#one').offset().top) {
$('.nav').css({'position':'fixed'});
console.log('ss');
} else{
$('.nav').css({'position':'absolute'});
}
})
$('.nav p').click(function(){
var i = $('.navp').index(this);
var x = $('.leftp').eq(i).offset().top;
$('html, body').animate({scrollTop:x+'px'},500);
})
</script>
</body>
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