复制代码 代码如下:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>oec2003</title>
<script language="JavaScript" type="text/JavaScript">
<!--
function toggle(targetid){
    if (document.getElementById){
        target=document.getElementById(targetid);
            if (target.style.display=="block"){
                target.style.display="none";
            } else {
                target.style.display="block";
            }
    }
}
-->
</script>
<style type="text/css">
<!--
#div1{
background-color:#000000;
height:400px;
width:400px;
display:none;
}
-->
</style>
</head>

<body>
<input type="button" id="butn" value="显示/隐藏" onclick="toggle('div1')" />
<center>
<div id="div1"></div></center>
居中的DIV
</body>
</html>              

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