js實現分享到隨頁面滾動而滑動效果的方法

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js實現分享到隨頁面滾動而滑動效果的方法

 頁面向上向下滾動,分享到的模組隨著滑動。

要點:

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:

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<!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 = null

function 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>

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