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<!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<title>Fmpq教程(fmpq.com)</title> 
<script>
function displayResult(){
    document.getElementById("p1").style.fontFamily="Impact,Charcoal,sans-serif";
}
</script>
</head>
<body>
<p id="p1">这是一些文本。</p>
<br>
<button type="button" onclick="displayResult()">修改字体</button>
 
</body>
</html>