​x
 
<html>
<head>
<script type="text/javascript">
function convertToUcase()
{
document.getElementById("fname").value=document.getElementById("fname").value.toUpperCase()
document.getElementById("lname").value=document.getElementById("lname").value.toUpperCase()
}
</script>
</head>
​
<body>
<form name="form1">
名：<input type="text" id="fname" size="20" />
<br /><br />
姓：<input type="text" id="lname" size="20" />
<br /><br />
转换为大写
<input type="checkBox" onclick="if (this.checked) {convertToUcase()}">
</form>
</body>
​
</html>
​