网页上的字体缩放，JavaScript代码

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<!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>
<style type="text/css">
</style>
<title>字体大中小代码&字号缩放代码</title>
</head>
<body>
<script type="text/javascript">
function doZoom(size) {
var zoom = document.all ? document.all['Zoom'] : document.getElementById('Zoom');
zoom.style.fontSize = size + 'px';
}
</script>
字体大小:<a href="javascript:doZoom(12)">小</a> <a href="javascript:doZoom(14)">中</a> <a href="javascript:doZoom(16)">大</a>
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<div id="Zoom">源码爱好者祝福看到此页的朋友们，工作顺利，天天开心！</div>
<br />
</body>
</html>