js运动之"随网页滚动而滚动的广告框"
2018-01-17 本文已影响0人
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
#div1 {
width: 100px;
height: 150px;
background: red;
position: absolute;
right: 0;
bottom: 0;
}
</style>
<script>
window.onscroll=function(){
var oDiv=document.getElementById('div1');
var scrollTop=document.documentElement.scrollTop||document.body.scrollTop;
startMove(oDiv.style.top=document.documentElement.clientHeight-oDiv.offsetHeight+scrollTop);
};
var timer=null;
function startMove(iTarget){
var oDiv=document.getElementById('div1');
clearInterval(timer);
timer=setInterval(function(){
var speed=(iTarget-oDiv.offsetTop)/6;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
if(oDiv.offsetTop==iTarget){
clearInterval(timer);
}
else{
oDiv.style.top=oDiv.offsetTop+speed+'px';
}
},30);
}
</script>
</head>
<body style="height: 2000px">
<div id="div1"></div>
</body>
</html>
