<html>
<head>
<title>HTML元素的显示与隐藏控制</title>
<script type="text/javascript">
function showAndHidden1(){
var p1=document.getElementById("p1");
var p2=document.getElementById("p2");
if(p1.style.display=='block') p1.style.display='none';
else p1.style.display='block';
if(p2.style.display=='block') p2.style.display='none';
else p2.style.display='block';
}
function showAndHidden2(){
var p3=document.getElementById("p3");
var p4=document.getElementById("p4");
if(p3.style.visibility=='visible') p3.style.visibility='hidden';
else p3.style.visibility='visible';
if(p4.style.visibility=='visible') p4.style.visibility='hidden';
else p4.style.visibility='visible';
}
</script>
</head>
<body>
<p>display：元素的位置不被占用</p>
<p id="p1" style="display:block;">p 1</p>
<p id="p2" style="display:none;">p 2</p>
<input type="button" onclick="showAndHidden1();" value="p切换" />
<hr>
<p>visibility：元素的位置仍被占用</p>
<p id="p3" style="visibility:visible;">p 3</p>
<p id="p4" style="visibility:hidden;">p 4</p>
<input type="button" onclick="showAndHidden2();" value="p切换" />
</body>
</html>