3-19编程练习批改
来源：3-30 编程练习
慕田峪0316891
2018-05-09 11:43:22
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>string之大小写</title>
</head>
<body>
<script>
var str= "If you would have a thing well done,do it yourself";
var strUpper=str.toUpperCase();//补充代码
document.write(strUpper);
document.write("<br/>")
var strLower=strUpper.toLowerCase();//补充代码
document.write(strLower);
</script>
</body>
</html>
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1回答
-
经测试效果是可以的呢，棒棒哒~~
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