通过display或visibility来实现HTML元素的显示与隐藏
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有些时候我们需要根据某些条件来控制Web页面中的HTML元素显示还是隐藏，可以通过display或visibility来实现。通过狼蚁网站SEO优化的例子了解display和visibility的区别，简单的例子代码如下：
<html>
<head>
<title>HTML元素的显示与隐藏控制</title>
<script type="text/javascript">
function showAndHidden1(){
var div1=document.getElementById("div1");
var div2=document.getElementById("div2");
if(div1.style.display=='block') div1.style.display='none';
else div1.style.display='block';
if(div2.style.display=='block') div2.style.display='none';
else div2.style.display='block';
}
function showAndHidden2(){
var div3=document.getElementById("div3");
var div4=document.getElementById("div4");
if(div3.style.visibility=='visible') div3.style.visibility='hidden';
else div3.style.visibility='visible';
if(div4.style.visibility=='visible') div4.style.visibility='hidden';
else div4.style.visibility='visible';
}
</script>
</head>
<body>
<div>display：元素的位置不被占用</div>
<div id="div1" style="display:block;">DIV 1</div>
<div id="div2" style="display:none;">DIV 2</div>
<input type="button" onclick="showAndHidden1();" value="DIV切换" />
<hr>
<div>visibility：元素的位置仍被占用</div>
<div id="div3" style="visibility:visible;">DIV 3</div>
<div id="div4" style="visibility:hidden;">DIV 4</div>
<input type="button" onclick="showAndHidden2();" value="DIV切换" />
</body>
</html>
复制代码
代码如下:<html>
<head>
<title>HTML元素的显示与隐藏控制</title>
<script type="text/javascript">
function showAndHidden1(){
var div1=document.getElementById("div1");
var div2=document.getElementById("div2");
if(div1.style.display=='block') div1.style.display='none';
else div1.style.display='block';
if(div2.style.display=='block') div2.style.display='none';
else div2.style.display='block';
}
function showAndHidden2(){
var div3=document.getElementById("div3");
var div4=document.getElementById("div4");
if(div3.style.visibility=='visible') div3.style.visibility='hidden';
else div3.style.visibility='visible';
if(div4.style.visibility=='visible') div4.style.visibility='hidden';
else div4.style.visibility='visible';
}
</script>
</head>
<body>
<div>display：元素的位置不被占用</div>
<div id="div1" style="display:block;">DIV 1</div>
<div id="div2" style="display:none;">DIV 2</div>
<input type="button" onclick="showAndHidden1();" value="DIV切换" />
<hr>
<div>visibility：元素的位置仍被占用</div>
<div id="div3" style="visibility:visible;">DIV 3</div>
<div id="div4" style="visibility:hidden;">DIV 4</div>
<input type="button" onclick="showAndHidden2();" value="DIV切换" />
</body>
</html>