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toUpperCase() 方法用於把字串轉換為大寫。
文法
stringObject.toUpperCase()傳回值
一個新的字串，在其中 stringObject 的所有小寫字元全部被轉換為了大寫字元。
<html>
<script language="JavaScript">
<!--
var myString = new String(prompt("Please enter some various case text", ""));document.write(myString.toUpperCase());
document.close();
-->
</script>
</html>
說明
JavaScript中toUpperCase函數方法對非字母字元不會產生影響。
<html>
<head>
<title>Convert String to upper case</title>
<script type="text/網頁特效" language="javascript">
<!-- //
onload = function(){
var s = new String("aaA我");
var upperCase = s.toUpperCase();
document.write(upperCase);
}
// -->
</script>
</head>
<body></body>
綜合上述來看看大小寫轉換
把你的代碼改了下,看合不合你的要求
<html>
<head>
<script language="javascript">
function loadSome() {
var text1 = document.getElementById('textfield1');
text1.focus();
}
function toUpper() {
document.getElementById('textfield2').value = document.getElementById('textfield1').value.toUpperCase();
}
function toLower(){
document.getElementById("textfield4").value = document.getElementById("textfield3").value.toLowerCase();
}</script>
<title>大小寫轉換</title>
</head>
<body onload="loadSome();">
<form action="" method="" >
<p>
<input type="text" id="textfield1">
<input type="button" name="submit" value="小-大" onclick="toUpper();">
<input type="text" id="textfield2" value="">
</p>
<p>
<input type="text" id="textfield3">
<input type="button" name="submit2" value="大-小" onclick="toLower();">
<input type="text" id="textfield4" value="">
</p>
</form>
</body>
</html>
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