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js to dynamically change font size code_javascript skills

WBOY
WBOYOriginal
2016-05-16 17:05:371325browse

In order to make it easier for users to read text, many large websites provide a font size selection function to adapt to the reading needs of people of different ages. In fact, this function is very simple to implement and easy to modify. The font size is large. The size is up to you. The default font size can be defined in the CSS page. The standard font for general web pages is 9pt, which is 12px;

Example code one: 

<!DOCTYPE html> 
<html> 
<head> 
<title>修改字体大小.html</title> 

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 
<meta http-equiv="description" content="this is my page"> 
<meta http-equiv="content-type" content="text/html; charset=UTF-8"> 

<!--<link rel="stylesheet" type="text/css" href="./styles.css">--> 
<style type="text/css"> 
div{ 
border:1px red solid; 
width:455px; 
font-size:16px; 
} 
.max{ 
font-size:20px; 
} 
.moren{ 
font-size:16px; 
} 
.min{ 
font-size:12px; 
} 
</style> 
<script type="text/javascript"> 
//此种方式降低了js和CSS的耦合性 
function changeFontSize(fontStyle){ 
// 获取节点对象 
var divNode = document.getElementsByTagName("div")[0]; 
// 设置该节点的Name属性以及属性值 
divNode.className=fontSize; 
} 
/* 
function changeFontSize2(fontSize){ 
// 获取节点对象 
var divNode = document.getElementsByTagName("div")[0]; 
divNode.style.fontSize=fontSize; 
} 
*/ 
</script> 
</head> 

<body> 
<a href="javascript:void(0)" onclick="changeFontSize2('20px')" class="max">大号</a> 
<a href="javascript:void(0)" onclick="changeFontSize2('16px')" class="moren">中号</a> 
<a href="javascript:void(0)" onclick="changeFontSize2('12px')" class="min">小号</a> 
<div> 
这里呢就是显示的文字，通过点击上面的超链接改变此字体大小<br/> 
这里呢就是显示的文字，通过点击上面的超链接改变此字体大小<br/> 
这里呢就是显示的文字，通过点击上面的超链接改变此字体大小<br/> 
这里呢就是显示的文字，通过点击上面的超链接改变此字体大小<br/> 
这里呢就是显示的文字，通过点击上面的超链接改变此字体大小<br/> 
这里呢就是显示的文字，通过点击上面的超链接改变此字体大小<br/> 
这里呢就是显示的文字，通过点击上面的超链接改变此字体大小<br/> 
这里呢就是显示的文字，通过点击上面的超链接改变此字体大小<br/> 
这里呢就是显示的文字，通过点击上面的超链接改变此字体大小<br/> 
这里呢就是显示的文字，通过点击上面的超链接改变此字体大小<br/> 
这里呢就是显示的文字，通过点击上面的超链接改变此字体大小<br/> 
</div> 
</body> 
</html>

Instance method two: 

<html>
<head>
<title>JavaScript设置网页字体</title>
<style>
body{
font-size:9pt;
}
</style>
</head>
<body>
<div id=zoom>这是一段示例文字，你可以点击下边选择不同字号的字体，这段文字会随即改变大小。脚本之家。</div>
<SCRIPT language=JavaScript>
function doZoom(size){
document.getElementById('zoom').style.fontSize=size+'pt'
}
</SCRIPT>
<P align=right>选择字号：[ <A 
 href="javascript:doZoom(13)">13pt（超大）</A> <A 
 href="javascript:doZoom(10.5)">10.5pt（中型）</A> <A 
 href="javascript:doZoom(9)">9pt（标准）</A> ]
</body>
</html>
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