大神求指导下，透明度没有变化，看了半天，还是不知道错在哪，T-T!
<!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>无标题文档</title>
<style type="text/css">
*{margin:0;padding:0;}
#one{ width:200px;height:200px;
background:red;
filter:alpha(opacity:30);
opacity:0.3;
}
</style>
<script>
window.onload=function(){
var dd=document.getElementsById('one');
dd.onmouseover=function(){
startMove(100);
}
dd.onmouseout=function(){
startMove(30);
}
var timer=null;
var alpha=30;
function startMove(iTarget){
var dd=document.getElementsById('one');
clearInterval(timer);
timer=setInterval(function(){
var speed=0;
if(alpha>iTarget){
speed=-10;
}else{
speed=10;
}
if(alpha==iTarget){
clearInterval(timer);
}else{
alpha+=speed;
dd.style.opacity='alpha(opacity:'+alpha+')';
dd.style.opacity=alpha/100;
}
},30)
}
}
</script>
</head>
<body>
<div id='one'></div>
</body>
</html>
追风的少年丶2回答
-
野猫1
var dd=document.getElementsById('one');同学，问题在这里，应该是var dd = document.getElementById("one"),是Element不是Elements。代码中有两处同样的问题，更改之后，正常运行 -
superheroes丶
你2个地方这个写错了：var dd=document.getElementsById('one');正确的是这样：var dd=document.getElementById("one");
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