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js實現分享到隨頁面滾動而滑動效果的方法，js滑動
本文執行個體講述了js實現分享到隨頁面滾動而滑動效果的方法。分享給大家供大家參考。具體如下：
頁面向上向下滾動，分享到的模組隨著滑動。
要點：
複製代碼 代碼如下:var scrtop =document.documentElement.scrollTop||document.body.scrollTop;
var height = document.documentElement.clientHeight||document.body.clientHeight;
var top = scrtop + (height - jb51.offsetHeight)/2;
top = parseInt(top);
獲得頁面垂直置中的位置
上代碼：
<!DOCTYPE html><html><head><meta charset="gb2312" /><title>無標題文檔</title><style>body{margin:0; padding:0; font:12px/1.5 arial; height:2000px;}#jb51{width:100px; height:200px; line-height:200px;text-align:center; border:1p solid #ccc;background:#f5f5f5; position:absolute; left:-100px; top:0;}#jb51_tit{position:absolute; right:-20px; top:60px;width:20px; height:60px; padding:10px 0;background:#06c; text-align:center;line-height:18px; color:#fff;}</style><script>window.onload = function(){ var jb51 = document.getElementById("jb51"); jb51.onmouseover = function(){ startrun(jb51,0,"left") } jb51.onmouseout = function(){ startrun(jb51,-100,"left") } window.onscroll = window.onresize = function(){ var scrtop=document.documentElement.scrollTop||document.body.scrollTop; var height=document.documentElement.clientHeight||document.body.clientHeight; var top = scrtop + (height - jb51.offsetHeight)/2; top = parseInt(top); startrun(jb51,top,"top") }}var timer = nullfunction startrun(obj,target,direction){ clearInterval(timer); timer = setInterval(function(){ var speed = 0; if(direction == "left"){ speed = (target-obj.offsetLeft)/8; speed = speed>0?Math.ceil(speed):Math.floor(speed); if(obj.offsetLeft == target){ clearInterval(timer); }else{ obj.style.left = obj.offsetLeft + speed + "px"; } } if(direction == "top"){ speed = (target-obj.offsetTop)/8; speed = speed>0?Math.ceil(speed):Math.floor(speed); if(obj.offsetTop == target){ clearInterval(timer); }else{ obj.style.top = obj.offsetTop + speed + "px"; } document.title = obj.offsetTop + ',' + target + ',' +speed; } },30)}</script></head><body><div id="jb51"> 分享到內容 <span id="jb51_tit">分享到</span></div></body></html>
希望本文所述對大家的javascript程式設計有所協助。
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