[JavaScript知识库] jquery导航置顶

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[JavaScript知识库]jquery导航置顶

<!DOCTYPE?html>

<html?lang="en">

<head>

????<meta?charset="UTF-8">

????<meta?name="viewport"?content="width=device-width,?initial-scale=1.0">

????<title>Document</title>

</head>

<style>

????*{

????????margin:?0;

????????padding:?0;

????}

????#header{

????????width:?100%;

????????height:?70px;

????????background:?red;

????????z-index:?999;

????}

????#banner{

????????width:?100%;

????????height:?590px;

????????background:green;

????}

????#btmherder{

????????width:?100%;

????????height:?56px;

????????background:?yellow;

????????z-index:?1;??

????}

????.fixnav?{

????????position:?fixed;

????????top:?0px;

????}

????.btmfixnav?{

????????position:?fixed;

????????top:?70px;

????}

????.slideup{

????????-webkit-animation:slideup?.2s?normal;?/*Safari?and?Chrome*/

????}

????@keyframes?slideup

????{

????????from?{top:0px;}

????????to?{top:-70px;}

????}

????@-webkit-keyframes?slideup?/*Safari?and?Chrome*/

????{

????????from?{top:0px;}

????????to?{top:-70px;}

????}

????.slidedown{

????????-webkit-animation:slidedown?.2s?normal;?/*Safari?and?Chrome*/

????}

????@keyframes?slidedown

????{

????????from?{top:-70px;}

????????to?{top:0px;}

????}

????@-webkit-keyframes?slidedown?/*Safari?and?Chrome*/

????{

????????from?{top:-70px;}

????????to?{top:0px;}

????}

????.btmheaderdown{

????????-webkit-animation:btmheaderdown?.2s?normal;?/*Safari?and?Chrome*/

????}

????@keyframes?btmheaderdown

????{

????????from?{top:0px;}

????????to?{top:70px;}

????}

????@-webkit-keyframes?btmheaderdown?/*Safari?and?Chrome*/

????{

????????from?{top:0px;}

????????to?{top:70px;}

????}

????.btmheaderup{

????????-webkit-animation:btmheaderup?.2s?normal;?/*Safari?and?Chrome*/

????}

????@keyframes?btmheaderup

????{

????????from?{top:70px;}

????????to?{top:0px;}

????}

????@-webkit-keyframes?btmheaderup?/*Safari?and?Chrome*/

????{

????????from?{top:70px;}

????????to?{top:0px;}

????}

????

</style>

<body>

????<div?id="header">

????????<p>顶部导航</p>

????</div>

????<div?id="banner">

????????banner

????</div>

????<div?id="btmherder">

????????下部导航

????</div>

????<div>

????????<p>内容</p>

????</div>

</body>

</html>

</script>

????var?t?=?0,?b?=?0;

????console.log($(window).scrollTop());

????

$(window).scroll(function(){

????t?=?$(this).scrollTop();

????//下部导航

????if($(window).scrollTop()>=570){

????????$("#btmherder").addClass('fixnav');

????}else{

????????$("#btmherder").removeClass('fixnav');

????}

????if(b?<?t){

????????console.log('向下滚动中...')

????????//下部导航

????????if($(window).scrollTop()>=570){

????????????$("#btmherder").removeClass('btmheaderdown')

????????????$("#btmherder").addClass('btmheaderup')

????????????$("#btmherder").css('top','0px')

????????}

????????//顶部导航

????????$("#header").removeClass('slidedown')

????????if(?$(window).scrollTop()<=570){

????????????$("#header").addClass('fixnav');

????????}

????????if(?$(window).scrollTop()>=570){

????????????$("#header").addClass('slideup')

????????????setTimeout(()=>{

????????????????$("#header").removeClass('fixnav')

????????????},200)

????????}

????}else{

????????console.log("向上滚动：");

????????//下部导航

????????if($(window).scrollTop()>=570){

????????????$("#btmherder").removeClass('btmheaderup')

????????????$("#btmherder").addClass('btmheaderdown')

????????????$("#btmherder").css('top','70px')

????????}

????????//顶部导航

????????$("#header").removeClass('slideup')

????????if(?$(window).scrollTop()>=70){

????????????$("#header").addClass('slidedown');

????????????????$("#header").addClass('fixnav');

????????}

????????if(?$(window).scrollTop()==0){

????????????$("#header").removeClass('fixnav')

????????}

????}

????setTimeout(function(){

????????b?=?t

????},?0)

})

????setTimeout(()=>{

????????if($(window).scrollTop()>=570){

????????????$("#btmherder").css('top','0px')

????????}

????},200)

</script>

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加:2021-10-08 11:42:45 更:2021-10-08 11:42:59

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