改变页面元素字体大小

<html>

<script language="JavaScript">

function changFont( x ){
    var font_style = x;
    var article = document.getElementById("article");
    if( typeof font_style == "string" ){
        article.style.fontWeight = font_style;
    } else {
        article.style.fontSize = font_style;
    }
}

</script>

<body>
<p>
<a onClick="changFont('normal');">正常</a> <a onClick="changFont('bold');">粗体</a>
<a onClick="changFont(14);">小号</a> <a onClick="changFont(18);">大号</a>
</p>
<p id="article">
我是一些文字 ...<br />
Some Text ...
</p>
</body>
</html>