Javascript charCodeAt() 没有返回正确的代码..或者是吗？

Question

我正在尝试查找键码(如果这正是我需要的)并将字符更改为递增的键码(这只是为了编码挑战)，但它不起作用

function LetterChanges(str) { 
var newString = "";
var keyCode;
  for(var i = 0; i < str.length; ++i)
  {

    keyCode = str.charCodeAt(i);
    console.log(keyCode);
    if( keyCode > 57 && keyCode < 122)
    {

         //add 1 to the keycode

         newString += String.fromCharCode(i+1);
         //console.log(String.fromCharCode(i+1));

    }
    else if(keyCode === 90)
    {
        //if it's a z being examined, add an a
         newString += "a";
    }
    else
        //it is a symbol, so just add it to the new string without change
        newString += str[i];
    }
  return newString.toUpperCase();

}

console.log(LetterChanges("Charlie"));

Answer 1

改变

newString += String.fromCharCode(i+1);

至

newString += String.fromCharCode(keyCode+1);