2018-5-31 11:51:40 网络 A+
<style> .rg_fixed {position: fixed;width:100%;bottom:80px;_position:absolute;_bottom:auto;_top:expression(eval(document.documentElement.scrollTop)+3);} </style> //滚动顶部判断 <script> var bdggrgtop=$(".Footer-top").offset().top; $(window).scroll(function(){console.log($(this).scrollTop()); if($(this).scrollTop()<bdggrgtop){ $('#test2').addClass('rg_fixed') }else{ $('#test2').removeClass('rg_fixed'); } }); </script> //滚动底部判断 <script> $(function($) { var ttop=$("#test3").offset().top; var theight=$("#test3").height(); console.log(theight); var ttop2=$("footer").offset().top; var theight2=$("footer").height(); $(window).scroll(function(){ if($(this).scrollTop()+$(window).height()<(ttop2+theight-40)){ $('#test3').addClass('rg_fixed') }else{ $('#test3').removeClass('rg_fixed'); } }); }); </script>