<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <TITLE> New Document </TITLE> <style> .imgover{opacity=0.5;filter:alpha(opacity=50)} .imgout{opacity=1;filter:alpha(opacity=100)} </style> <SCRIPT LANGUAGE="JavaScript"> function doover(obj) { obj.className="imgover"; //不起作用
} function doout(obj) { obj.className="imgout"; //不起作用
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<style>
.imgover{opacity=0.5;filter:alpha(opacity=50)}
.imgout{opacity=1;filter:alpha(opacity=100)} </style>
<SCRIPT LANGUAGE="JavaScript">
function doover(obj)
{ obj.className="imgover"; //不起作用
}
function doout(obj)
{ obj.className="imgout"; //不起作用
} </SCRIPT>
</HEAD> <BODY>
<img src="http://list.mp3.baidu.com/list/images/tupic/funny_egaosucai04.jpg"onmouseover="doover(this);" onmouseout="doout(this);" />
</BODY>
</HTML>
为什么 ie ok ff 不起作用？
<html><head><title></title>
<style type ="text/css">
#box{
width : 100px ;
height : 100px ;
position : absolute ;
left : 50px ;
bottom : 50px ;
}
a:link {color: yellow}
a:visited {color: red}
a:hover {color: green}
a:active {color: blue}
#imga {opacity:0.5;filter:alpha(opacity=50)}.imgover{opacity=0.5;filter:alpha(opacity=50)}
.imgout{opacity=1;filter:alpha(opacity=100)}
</style>
<script>
function doover(obj)
{ obj.className="imgover";
}
function doout(obj)
{obj.className="imgout";}
</script>
</head><body>
<div id="box">
<a href="http://www.gruden.com" target="_blank">This is my link.</a>
<img id="imga" alt="gruden" src="http://www.gruden.com/images/gruden_logo.gif" />
<!--<img id="imgb" alt="gruden" src="http://www.gruden.com/images/gruden_logo.gif" onmouseover="this.style.opacity=0.5;this.filters.alpha.opacity=50"
onmouseout="this.style.opacity=1;this.filters.alpha.opacity=100" /> -->
<img id="imgb" alt="gruden" src="http://www.gruden.com/images/gruden_logo.gif" onmouseover="doover(this);" onmouseout="doout(this);" />
</div>
</body></html>
obj.setAttribute("className",strStyle);
else
obj.setAttribute("class",strStyle);
-moz-opacity:0.8;
}下面这样就兼容IE和FF了：
divobj{
filter = alpha(opacity=580);
-moz-opacity = 0.5;
}