Javascript 回到顶部
回到顶部是个常用的js小脚本,我们在平常见到的很多网站上面都有这样的功能,今天我就把之前写的这个实例放到这里,欢迎鉴定使用测试!
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>回到顶部</title> <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script> <style type="text/css"> #main { width: 1000px; height: 3200px; } #go_top { display: none; position: fixed; right: 10px; bottom: 10px; z-index: 100px; } #go_a_top { display: block; width: 50px; height: 50px; background: url(/returnTop/Img/go_top.gif) no-repeat 0 0 transparent; } #go_a_top:hover { background: url(/returnTop/Img/go_top.gif) no-repeat 0 -100px transparent; } </style> <script type="text/javascript"> $.fn.extend({ returnTop: function () { var $elem = this.find("a:first"); var $this = this; $elem.bind("click", function () { $("body,html").animate({ scrollTop: 0 }, 150); }); $("body") .add($(window)) .bind("scroll", function () { var st = $(document).scrollTop(); (st > 100) ? $this.fadeIn(500) : $this.fadeOut(500); }); } }); $(function () { $("#go_top").returnTop(); }); </script> </head> <body> <div id="main"> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nihao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> <p>nibuhaohao</p> </div> <div id="go_top"> <a id="go_a_top" href="javascript:;" title="回到顶部"><img src="http://res.c.hjfile.cn/app/images/go_top.gif" /></a> </div> </body> </html>
以上就是完成的实例代码,欢迎转载和使用,如果有什么不足和错误之处,希望能够拍砖指出,大家共同交流进步(*^__^*) 嘻嘻!