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我想猜猜用戶輸入什麼類型的字母。有人可以解釋代碼中發生了什麼?
var userLetter = prompt("Enter a letter and I will tell you what type of letter is","Enter here, wish me luck!");
function selectUserLetter(letter) {
var returnType = "NA";
if (userLetter.charCodeAt(0) >= "A".charCodeAt(0) && userLetter.charCodeAt(0) <= "Z".charcodeAt(0)) {
returnType = "U";
}
else if (userLetter.charCodeAt(0) >= "a".charCodeAt(0) && userLetter.charCodeAt(0) <= "z".charcodeAt(0)) {
returnType = "L";
}
else if (userLetter.charCodeAt(0) >= "0".charCodeAt(0) && userLetter.charCodeAt(0) <= "9".charcodeAt(0)) {
returnType = "N";
}
return returnType;
}
switch (selectUserLetter(userLetter)) {
case "U":
document.write("Your letter is Uppercase");
break;
case "L":
document.write("Your letter is Lowercase");
break;
case "N":
document.write("Your letter is a number");
break;
default:
document.write("You typed anything else");
}
這麼傻我的錯誤...我想我有一些問題的變量或參數。非常感謝! –