Posted in Javascript onApril 10, 2015
本文实例讲述了js实现分享到随页面滚动而滑动效果的方法。分享给大家供大家参考。具体如下：
页面向上向下滚动，分享到的模块随着滑动。
要点：
var scrtop =document.documentElement.scrollTop||document.body.scrollTop; var height = document.documentElement.clientHeight||document.body.clientHeight; var top = scrtop + (height - 3water.offsetHeight)/2; top = parseInt(top);
获得页面垂直居中的位置
上代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="gb2312" />
<title>无标题文档</title>
<style>
body{margin:0; padding:0; font:12px/1.5 arial; height:2000px;}
#3water{width:100px; height:200px; line-height:200px;
text-align:center; border:1p solid #ccc;
background:#f5f5f5; position:absolute; left:-100px; top:0;}
#3water_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 3water = document.getElementById("3water");
3water.onmouseover = function(){
startrun(3water,0,"left")
}
3water.onmouseout = function(){
startrun(3water,-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 - 3water.offsetHeight)/2;
top = parseInt(top);
startrun(3water,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="3water">
分享到内容
<span id="3water_tit">分享到</span>
</div>
</body>
</html>
希望本文所述对大家的javascript程序设计有所帮助。
js实现分享到随页面滚动而滑动效果的方法
- Author -
jingangel声明：登载此文出于传递更多信息之目的，并不意味着赞同其观点或证实其描述。
Reply on: @reply_date@
@reply_contents@