<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <!--引入jQuery--> <script src="http://apps.bdimg.com/libs/jquery/1.8.3/jquery.js"></script> <title>Js控制网页滑动的时候顶部导航条变成半透明</title> <style type="text/css"> .main{ width:100%; height:2000px; background:gray; } .nav{ width:100%; height:100px; background:black; position:fixed; top:0; } .content{ position: f; top: 0; right: 0; left: 0; bottom: 2.5rem; } </style> </head> <body> <div class="nav"></div> <div class="main"></div> <script> function _scroll(){ var scrollTop =$(window).scrollTop(); if(scrollTop<10){ $('.nav').css('opacity',1); }else{ $('.nav').css('opacity',0.1); } } $(window).on('scroll',function() { _scroll() }); </script> </body> </html>
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