炫酷的返回頂部功能
js核心代碼
window.onscroll = function(){ var t = document.documentElement.scrollTop || document.body.scrollTop; var top_div = document.getElementById( "go" ); if( t >= 300 ) { top_div.style.display = "block"; } else { top_div.style.display = "none"; } } var ptt=20;function pageScroll() { document.getElementById('flypig').style.display='block';window.scrollBy(0,-10); //每次上升10px if(document.body.scrollTop==0) { document.getElementById('flypig').style.marginBottom=ptt+'px'; ptt=ptt+10; }scrolldelay = setTimeout('pageScroll()',2); //2毫秒重復執行一次 if(ptt>=1000){ ptt=0; document.getElementById('flypig').style.marginBottom=20+'px'; document.getElementById('flypig').style.display='none'; clearTimeout(scrolldelay);}//pageScroll ends} html
<!DOCTYPE html><html><head> <title>返回頂部按鈕的實現</title> <meta charset="utf-8" /><style>body{ margin:0px;}#flypig{ display: none; float: left; position: fixed; bottom: 20px; margin-left: 75%; cursor: pointer; margin-bottom: 20px;}#go{ display: block; float: left; position: fixed; bottom: 10px; margin-left: 75%; cursor: pointer;}</style><script> window.onscroll = function(){ var t = document.documentElement.scrollTop || document.body.scrollTop; var top_div = document.getElementById( "go" ); if( t >= 300 ) { top_div.style.display = "block"; } else { top_div.style.display = "none"; } } var ptt=20;function pageScroll() { document.getElementById('flypig').style.display='block';window.scrollBy(0,-10); //每次上升10px if(document.body.scrollTop==0) { document.getElementById('flypig').style.marginBottom=ptt+'px'; ptt=ptt+10; }scrolldelay = setTimeout('pageScroll()',2); //2毫秒重復執行一次 if(ptt>=1000){ ptt=0; document.getElementById('flypig').style.marginBottom=20+'px'; document.getElementById('flypig').style.display='none'; clearTimeout(scrolldelay);}//pageScroll ends} </script></head><body><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><h1 style="text-align:center;">請往下滑</h1><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><!--讓你的頁面足夠的長--><div style="display: none; float: left; position: fixed; margin-left: 50%; cursor: pointer; margin-bottom: 20px;" id="flypig"><img src="/wp-content/themes/Jakesoft/images/flypig.gif"> </div><div style="display: none; float: left; position: fixed; bottom: 10px; margin-left: 50%; cursor: pointer;" id="go" onclick="pageScroll()">返回頂部</div></html>以上所述就是本文的全部內容了，希望大家能夠喜歡。
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