jquery网页回到顶部效果(图标渐隐,自写)_jquery

//回到顶部js <br>$(function(){ <br>var $btn_top = $('<a id="scrollTopBtn"><img  src="css/web/images/scrollTop.png" alt="jquery网页回到顶部效果(图标渐隐,自写)_jquery" ></a>'); <br>$btn_top.css({ <br>'display':'none', <br>'width':'40px', <br>'height':'40px', <br>'position':'fixed', <br>'right':'20px', <br>'bottom':'100px', <br>'z-index':'999' <br>}); <br>$("body").append($btn_top); <br>$("body").on("click","#scrollTopBtn",function(){ <br>$("html,body").animate({scrollTop: 0},"slow"); <br>}); <br>var $btn = $("#scrollTopBtn"); <br>if($(window).scrollTop() > 100){ <br>$btn.fadeIn(600); <br>} <br>$(window).scroll(function(){ <br>if($(window).scrollTop() > 100){ <br>$btn.fadeIn(600); <br>}else{ <br>$btn.fadeOut(600); <br>} <br>}); <br>}); <br>