文中实例为大伙儿共享了jquery完成吸顶导航栏实际效果的实际编码,供大伙儿参考,具体内容以下

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;/*滚过原始部位时全自动吸顶*/
    position: sticky;/*吸顶时的精准定位*/
    top:1rem;
    left:auto;
    z-index: 999;/*z-index比正下方全部等级要高*/
  }

html:

<header>头顶部</header>
<section>
  <div class="bananers">內容</div>
  <div class="mains">
  <div>导航栏1</div>
  <div>导航栏2</div>
  <div>导航栏3</div>
  </div>
  <div class="contents"></div>
</section>
<footer>底部</footer>

js:

for(var i=0;i<20;i  ){
 $(".contents").append(`<div>${i 1}</div>`)
 }
 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);

之上便是文中的所有内容,期待对大伙儿的学习培训有一定的协助,也期待大伙儿多多的适用。