代码
<!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" />
<style type="text/css">
#data1{ position:absolute; top:100px; left:100px; padding:0px; width:200px; height:200px; background-color:#FFFF00; clip:rect(0px,200px,200px,0px);}
</style>
<script type="text/javascript">
var bottom=200;
var clipped=false;
document.onclick=testItem;
function testItem(){
if(clipped){
unClipItem();
}else{
clipItem();
}
}
function clipItem(){
bottom -= 20;
var clip="rect(0px,200px,"+bottom+"px,0px)";
var obj=document.getElementById("data1");
obj.style.clip=clip;
if(bottom==40){
clipped=true;
}else{
setTimeout("clipItem()",100);
}
}
function unClipItem(){
bottom +=20;
var clip="rect(0px,200px,"+bottom+"px,0px)";
var obj=document.getElementById("data1");
obj.style.clip=clip;
if(bottom==200){
clipped=false;
}else{
setTimeout("unClipItem()",100);
}
}
</script>
</head>
<body>
<div id="data1">
<p>this is the contained within the div block.</p>
</div>
</body>
</html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
#data1{ position:absolute; top:100px; left:100px; padding:0px; width:200px; height:200px; background-color:#FFFF00; clip:rect(0px,200px,200px,0px);}
</style>
<script type="text/javascript">
var bottom=200;
var clipped=false;
document.onclick=testItem;
function testItem(){
if(clipped){
unClipItem();
}else{
clipItem();
}
}
function clipItem(){
bottom -= 20;
var clip="rect(0px,200px,"+bottom+"px,0px)";
var obj=document.getElementById("data1");
obj.style.clip=clip;
if(bottom==40){
clipped=true;
}else{
setTimeout("clipItem()",100);
}
}
function unClipItem(){
bottom +=20;
var clip="rect(0px,200px,"+bottom+"px,0px)";
var obj=document.getElementById("data1");
obj.style.clip=clip;
if(bottom==200){
clipped=false;
}else{
setTimeout("unClipItem()",100);
}
}
</script>
</head>
<body>
<div id="data1">
<p>this is the contained within the div block.</p>
</div>
</body>
</html>