The special effect fixed on the top after the navigation bar is pulled down to a certain height

 <script type="text/javascript"> $(function(){ var nav=$(".nav"); //Get navigation object var win=$(window); //Get Window Object var sc=$(document);// Get the document document object. win.scroll(function(){   if(sc.scrollTop()>=100){     nav.addClass("fixednav");     }else{    nav.removeClass("fixednav");   } })   }) </script>

 .fixednav {     position: fixed;     top: 0px;     left: 0px;     width: 100%;     z-index: 999; }

yes twenty Comments from netizens:

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  wjy329 Five years ago (2019-06-04) reply

  The personal test is available, thank the blogger.

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  Netizens of Tianxing Studio Six years ago (2018-09-23) reply

  God wants to ask how to change the background color when scrolling the next page

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    Tianxing Studio Six years ago (2018-09-23) reply

    There should be css code in the article. Just add a color in it, not just Baidu w3c

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  Netizens of Tianxing Studio Six years ago (2018-08-04) reply

  . fixednav sets the attribute on the jsp page

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  Netizens of Tianxing Studio Six years ago (2018-06-27) reply

  Great Really

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  Netizens of Tianxing Studio Six years ago (April 30, 2018) reply

  No, html doesn't respond

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  Xie Xiao'an Six years ago (2018-01-25) reply

  Extremely powerful, super easy to use [very powerful writing!]

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  green hand Six years ago (2018-01-06) reply

  Js cannot be used, and the effect cannot be reflected

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    green hand Six years ago (2018-01-06) reply

    It's just that js has no effect

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  Brother Haha Six years ago (2018-01-03) reply

  Can't use it, landlord

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  Cheng Xubin Seven years ago (2017-12-13) reply

  What about the one with fixed bottom? How to change the scrolling height? Is the height of the page minus the height of the bottom div and then minus the height of the scroll bar, but how is the height of the scroll bar calculated?

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  Small Seven years ago (2017-12-05) reply

  Since we don't see html, we don't know which element is added by the navTmp classmaster. Can we explain it