<!doctype html><html lang="en"><head><meta charset="UTF-8"><title>返回顶部</title><script src="http://libs.baidu.com/jquery/1.11.1/jquery.min.js"></script><style type="text/css">.container { width:980px; margin:0 auto; height:auto; min-height:100%; position:relative; }.content { height: 2000px; border: 1px solid red; }#goToTop { position: fixed; bottom: 20px; right: 10%; }#goToTop a { background: none repeat scroll 0 0 #336699; border: 1px solid #CCCCCC; border-radius: 3px; -webkit-border-radius: 3px; color: #FF9966; font-size: 14px; padding: 5px; text-decoration: none; text-shadow: 0 1px 0 #999; -webkit-text-shadow: 0 1px 0 #999; }</style></head><body><div class="container"><div class="header"> 我是头部</div><div class="content">我是主内容,高度是2000px</div><div class="footer">我是在最底部</div><div id="goToTop"><a href="javascript:;">点我回到页面顶部</a></div></div><script>// 原始版$(function(){$('#goToTop a').click(function(){$('html , body').animate({scrollTop: 0},'slow');});});</script></body></html>
<!doctype html><html lang="en"><head><meta charset="UTF-8"><title>返回顶部</title><script src="http://libs.baidu.com/jquery/1.11.1/jquery.min.js"></script><style type="text/css">.container { width:980px; margin:0 auto; height:auto; min-height:100%; position:relative; }.content { height: 2000px; border: 1px solid red; }#goToTop { position: fixed; bottom: 20px; right: 10%; }#goToTop a { background: none repeat scroll 0 0 #336699; border: 1px solid #CCCCCC; border-radius: 3px; -webkit-border-radius: 3px; color: #ff0; font-size: 14px; padding: 5px; text-decoration: none; text-shadow: 0 1px 0 #999; -webkit-text-shadow: 0 1px 0 #999; }</style></head><body><div class="container"><div class="header"> 我是头部</div><div class="content">我是主内容,高度是2000px</div><div class="footer">我是在最底部</div><div id="goToTop"><a href="javascript:;">点我返回顶部</a></div></div><script>// 改进版$(function(){$('#goToTop').hide(); //隐藏go to top按钮$(window).scroll(function(){// console.log($(this).scrollTop());//当window的scrolltop距离大于1时,go toif($(this).scrollTop() > 100){$('#goToTop').fadeIn();}else{$('#goToTop').fadeOut();}});$('#goToTop a').click(function(){$('html ,body').animate({scrollTop: 0}, 300);return false;});});</script></body></html>
<!doctype html><html lang="en"><head><meta charset="UTF-8"><title>返回顶部</title><script src="http://libs.baidu.com/jquery/1.11.1/jquery.min.js"></script><style type="text/css">.container { width:980px; margin:0 auto; height:auto; min-height:100%; position:relative; }.content { height: 2000px; border: 1px solid red; }#goToTop {position: absolute; right: -130px; z-index: 9000; }#goToTop a { background: none repeat scroll 0 0 #336699; border: 1px solid #CCCCCC; border-radius: 3px; -webkit-border-radius: 3px; color: #ff0; font-size: 14px; padding: 5px; text-decoration: none; text-shadow: 0 1px 0 #999; -webkit-text-shadow: 0 1px 0 #999; }</style></head><body><div class="container"><div class="header"> 我是头部</div><div class="content">我是主内容,高度是2000px</div><div class="footer">我是在最底部</div></div><script>// 加强版(兼容性基本完好)$(function(){//goToTop距浏览器顶端的距离,这个距离可以根据你的需求修改var topDistance = 500;//距离浏览器顶端多少距离开始显示goToTop按钮,这个距离也可以修改,但不能超过浏览器默认高度,为了兼容不同分辨率的浏览器,我建议在这里设置值为1;var showDistance = 1;//定义一个变量,方便后面加入在html元素标签中插入这个goToTop按钮的标签var goToTopButton = $('<div id="goToTop"><a href="javascript:;">点我回到页面顶部</a></div>');var thisTop = $(window).scrollTop() + topDistance;//在container的div里插入我们前面定义好的html标签元素$('.container').append(goToTopButton);//设置goToTop按钮top的css属性和属性值$('#goToTop').css('top' ,thisTop);if($(window).scrollTop() < showDistance){$('#goToTop').hide();}// 给窗口绑定一个滚动事件,当窗口滚动条滚动时执行$(window).scroll(function(){// console.log($(this).scrollTop());thisTop = $(this).scrollTop() + topDistance; //获取当前window向上滚动的距离$('#goToTop').css('top', thisTop); //修改goToTop按钮的top距离console.log(thisTop);if($(this).scrollTop() > showDistance){$('#goToTop').fadeIn();}else{$('#goToTop').fadeOut();}});// 给按钮绑定一个click事件,点击按钮时,返回顶部$('#goToTop a').click(function(){$('html ,body').animate({scrollTop: 0}, 300);return false;});});</script></body></html>
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