App下載
實(shí)例代碼( Tip: 登錄后體驗(yàn)更佳 )
<!DOCTYPE html>
<html>
<head>
<script>
function convertToUcase()
{
document.getElementById("fname").value=document.getElementById("fname").value.toUpperCase();
}
</script>
</head>
<body>
<form name="form1">
First name: <input type="text" id="fname" size="20" value="Donald Duck">
<br><br>
Convert to upper case 
<input type="checkBox" onclick="if(this.checked){convertToUcase()}">
</form>
</body>
</html>
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