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oprity.html
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oprity.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>运用js实现透明度变化</title>
<link href="css/style.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="js/jquery.js"></script>
<style>
body{
margin: 0px;
}
#id1 {
height:100px;
width: 230px;
background: #687f92;
bottom: -50px;
position: relative;
opacity: 0.3;
filter: alpha(opacity:30);
}
</style>
<!-- 透明度变化 -->
<script type="text/javascript">
window.onload=function(){
var oDiv=document.getElementById('id1');
oDiv.onmouseover=function(){
startMove1(100);
}
oDiv.onmouseout=function(){
startMove1(30);
}
}
var timer=null;
var alpha=30;
function startMove1(iTarget){
var oDiv=document.getElementById('id1');
clearInterval(timer);
timer=setInterval(function(){
var speed=0;
if(alpha>iTarget){
speed=-10;
}
else{
speed=10;
}
if(alpha==iTarget){
clearInterval(timer);
}
else{
alpha+=speed;
oDiv.style.filter='alpha(opacity:'+alpha+')';
oDiv.style.opacity=alpha/100;
}
},30)
}
</script>
<body>
<div id="id1">导航栏</div>
</body>
</html>