在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<title>菜鸟教程(cainiaoplay.com)</title>
<style type="text/css">#ex1{
	border: thin dotted #FF0000;
}
</style>
<script>
function displayResult(){
	document.getElementById("ex1").style.border="thick solid #0000FF";
}
</script>
</head>
<body>

<div id="ex1">这是一些文本。</div>
<br>
<button type="button" onclick="displayResult()">修改边框</button>

</body>
</html>

源代码

动行结果