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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>
<head>
<style>
#div1 {
width:300px;
height:400px;
border:1px solid red;
}
#div1 img {
margin:150px auto; //水平居中、垂直居中
width:100px;
height:100px;
display:block;
}
</style>
</head>
<body>
<div id="div1">
<img src="2.jpg" />
</div>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<style>
#picbox{width:200px;height:200px;background:#ccc;}
#picbox img{width:100px;height:100px;}
</style>
<script>
function setCenter(Xelement)
{
var parent=Xelement.parentNode;
parent.style.position="relative";
Xelement.style.position="absolute";
var left=(parent.clientWidth-Xelement.clientWidth)/2;
var top=(parent.clientHeight-Xelement.clientHeight)/2;
Xelement.style.left=left+"px";
Xelement.style.top=top+"px";
}
</script>
</head>
<body>
<div id="picbox">
<img id="img1" src="2.jpg" alt="" onload="setCenter(this)"/>
</div>
</body>
</html>