本文实例为大家分享了jquery实现吸顶导航效果的具体代码，供大家参考，具体内容如下css:
*{margin:0;padding:0;}
body{
margin:0 auto;

max-width:10rem;
}
header{
width:10rem;
height:1rem;
background:red;
position:fixed;
top:0;
left:auto;
}
section{
height:100%;
overflow: auto;
padding:1rem 0;
}
.bananers{
width:100%;
height:3rem;
text-align: center;
line-height:3rem;
background: aqua;
}
.mains{
width:100%;
height:1rem;
background:red;
display: flex;
}
.mains>div{
width:100%;
height:100%;
border:1px solid #dddddd;
display: flex;
align-items: center;
justify-content: center;
}
.contents{
width:100%;
}
.contents>div{
height:50px;
line-height:50px;
padding-left:10%;
border-bottom:1px solid red;
}
footer{
width:10rem;
height:1rem;
background: #0086B3;
position:fixed;
left:auto;
bottom:0;
}

.fixed-top {

position: fixed;

width: 100%;

top:1rem;

left:auto;

}

.sticky {

position: -webkit-sticky;/*滚过初始位置时自动吸顶*/

position: sticky;/*吸顶时的定位*/

top:1rem;

left:auto;

z-index: 999;/*z-index比下方所有层级要高*/

}
*{margin:0;padding:0;}
body{
margin:0 auto;

max-width:10rem;
}
header{
width:10rem;
height:1rem;
background:red;
position:fixed;
top:0;
left:auto;
}
section{
height:100%;
overflow: auto;
padding:1rem 0;
}
.bananers{
width:100%;
height:3rem;
text-align: center;
line-height:3rem;
background: aqua;
}
.mains{
width:100%;
height:1rem;
background:red;
display: flex;
}
.mains>div{
width:100%;
height:100%;
border:1px solid #dddddd;
display: flex;
align-items: center;
justify-content: center;
}
.contents{
width:100%;
}
.contents>div{
height:50px;
line-height:50px;
padding-left:10%;
border-bottom:1px solid red;
}
footer{
width:10rem;
height:1rem;
background: #0086B3;
position:fixed;
left:auto;
bottom:0;
}

.fixed-top {

position: fixed;

width: 100%;

top:1rem;

left:auto;

}

.sticky {

position: -webkit-sticky;/*滚过初始位置时自动吸顶*/

position: sticky;/*吸顶时的定位*/

top:1rem;

left:auto;

z-index: 999;/*z-index比下方所有层级要高*/

}html：

头部

内容

导航1

导航2

导航3

头部

内容

导航1

导航2

导航3

js：
for(var i=0;i<20;i++){
$(".contents").append(``)
}
var headers=$("header")[0].getBoundingClientRect().height;
var mains=$(".mains").offset().top;
var heights=mains-headers;
$(".bananers").html(mains+"----"+headers);
var tops = document.querySelector('.mains');
function fixed(num) {

var nys= navigator.userAgent;

var isAndroid = nys.indexOf('Android') > -1 || nys.indexOf('Adr') > -1;

var isIOS = !!nys.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/);

if(isAndroid) {

document.body.onscroll = function(e) {

var scrollT = document.body.scrollTop;

if (scrollT > num) {

$(tops).addClass('fixed-top');

}else {

$(tops).removeClass('fixed-top');

}

};

}else if(isIOS) {

$(tops).addClass('sticky');

}

}
fixed(heights);
for(var i=0;i<20;i++){
$(".contents").append(``)
}
var headers=$("header")[0].getBoundingClientRect().height;
var mains=$(".mains").offset().top;
var heights=mains-headers;
$(".bananers").html(mains+"----"+headers);
var tops = document.querySelector('.mains');
function fixed(num) {

var nys= navigator.userAgent;

var isAndroid = nys.indexOf('Android') > -1 || nys.indexOf('Adr') > -1;

var isIOS = !!nys.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/);

if(isAndroid) {

document.body.onscroll = function(e) {

var scrollT = document.body.scrollTop;

if (scrollT > num) {

$(tops).addClass('fixed-top');

}else {

$(tops).removeClass('fixed-top');

}

};

}else if(isIOS) {

$(tops).addClass('sticky');

}

}
fixed(heights);以上就是本文的全部内容，希望对大家的学习有所帮助。