这是一个检查首字母大小写的代码，谁能帮我看看哪里错了啊？多谢！

<html>
<head>
<script language="JavaScript" type="text/javascript">
function checkCharType(charToCheck)
{
var returnvalue = "O";
var charCode = charToCheck.charCodeAt(0);

    if (charCode >= "A".charCodeAt(0) && charCode <= "Z".charCodeAt(0))
{
   returnvalue = "U;"
}
else if (charCode >= "a".charCodeAt(0) && charCode <= "z".charCodeAt(0))
{
   returnvalue = "L;"
}
else if (charCode >= "0".charCodeAt(0) && charCode <= "9".charCodeAt(0))
{
   returnvalue = "N;"
}

   return returnvalue;
}
</script>
</head>

var mystring = prompt("Enter some text","hello world");
switch(checkCharType(mystring))
{
   case "U":
         document.write("First character was upper case");
         break;
   case "L":
         document.write("First character was lower case");
         break;
   case "N":
         document.write("First character was a number");
         break;
   default:
         document.write("First character was not a character or a number")
}
</script>

</body>
</html>

海贼12345

浏览 1377回答 1

1回答

杰杰就是我

请检查你的 checkCharType 方法中的赋值语句写的问题 returnvalue = "N;"这样你返回的是 '字母'+';'的形式 ,如 'L;' 所以肯定不能判断应该写成 returnvalue = "N";其他, 同理改正即可

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