實現 “返回頂部”功能
阿新 • • 發佈:2018-12-30
<!DOCTYPE html> <html> <head> <meta charset='utf-8'> <title>js2</title> <style> .returnTop{ position:fixed; width:50; height:60px; right:20px; bottom:20px; background-color:red; color:white; } .hide{ display:none; } </style> <body> <div id='return_top' class='returnTop hide' onclick='Go();'>返回頂部</div> <div style='height:3000px;'></div> <script src='js/jquery-1.8.2.js'></script> <script src='js/oldboy.js'></script> <script type='text/javascript'> $(windw).scroll(function(){ var height = $(window).scrollTop(); if(height > 0){ $('#return_top').removeClass('hide') } else{ $('return_top').addClass('hide') } }); function Go(){ $(window).scrollTop(0); } </script> </body> </head> </html> ==================方法2==================== <!DOCTYPE html> <html> <head> <meta charset='utf-8'> <title>js2</title> <style> .returnTop{ position:fixed; width:50; height:60px; right:20px; bottom:20px; background-color:red; color:white; } .hide{ display:none; } </style> <body> <div id='return_top' class='returnTop hide'>返回頂部</div> <div style='height:3000px;'>asd</div> <script src='js/jquery-1.8.2.js'></script> <script src='js/oldboy.js'></script> <script type='text/javascript'> $(function(){ $('#return_top').click(function(){ $(window).scrollTop(0); }) }) $(windw).scroll(function(){ var height = $(window).scrollTop(); if(height > 0){ $('#return_top').removeClass('hide') } else{ $('return_top').addClass('hide') } }); </script> </body> </head> </html>