Question

我有以下程序但是当我尝试加密单词JAVASCRIPT时，似乎函数'encrypt'中的函数'rotateToPosition'不起作用。我得到的答案是Xjavascript。它在开始时显示符号字符X，因为我想要它，它会将plainArray中的字母更改为cipherArray，但它会转移它们。我正在寻找的答案是Xzqlqishyfj。有谁知道我做错了吗？感谢。

<HTML>

<HEAD>

<TITLE> 
Alberti's Disks
</TITLE>

<SCRIPT LANGUAGE = "JavaScript">



    // array of upper case letters
    var plainArray = ['A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'];
    // array of lower case letters
    var cipherArray = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'];

//The function shift all elements to the rignt

function right(letterArray)
{
    var ShiftToRightArray = new Array (26); //creates new array
    for (var count = 0; count < 25; count++) // checks every argument in the array
        {
            ShiftToRightArray[count + 1] = letterArray[count]; //assigns one argument from letterArray to index from new array increased by one
        }
     ShiftToRightArray[0] = letterArray[25]; //assigns last argument from letterArray to first index in new array
     return ShiftToRightArray; //returns value of new array
}


//The function simulates the rotation of a cipher alphabet

function rotateToPosition(signalCharacter, indexCharacter, plainAlphabet, cipherAlphabet)
{
    var rotateArray = new Array (26);
    rotateArray = cipherAlphabet;
    while (rotateArray[0] != indexCharacter)
        {
            rotateArray = right(rotateArray);
        }
    return rotateArray;
}

//Function to encrypt given word

function encrypt(plainText, signalCharacter, indexCharacter, plainAlphabet, cipherAlphabet)

{
   // rotate array to signal character position
   rotateToPosition(signalCharacter, indexCharacter, plainAlphabet, cipherAlphabet)
   //will hold the results of the encrpytion until it can be appended to encryptedString
   var encryptedString = signalCharacter;
   for (var count = 0; count < plainText.length; count++)
   {
       var singleLetter = plainText.charAt(count);
       var i = plainAlphabet.indexOf(singleLetter);
       encryptedString = encryptedString + cipherAlphabet[i];
   }

   return encryptedString;
}

function testTask02()
{
    window.alert(right(cipherArray));
}

function testTask03()
{
    window.alert(rotateToPosition('A', 'g', plainArray, cipherArray));
}

function testTask04()
{
//encrypts word JAVASCRIPT using X as signal character and n as index character
   window.alert(encrypt('JAVASCRIPT', 'X', 'n', plainArray, cipherArray));
}

</SCRIPT>

</HEAD>

<BODY>



    <FORM NAME = "Form">

    <STRONG>SIMULATING ALBERTI'S DISKS<BR></STRONG>

    <P>
    <INPUT TYPE = "button" NAME = "task02Button"  VALUE ="Test Task 2"
            ONCLICK = " testTask02() ;">    
    </P>
    <P>
    <INPUT TYPE = "button" NAME = "task03Button"  VALUE ="Test Task 3"
            ONCLICK = " testTask03() ;">    
    </P>
    <P>
    <INPUT TYPE = "button" NAME = "task04Button"  VALUE ="Test Task 4"
            ONCLICK = " testTask04() ;">    
    </P>
    </FORM>


</BODY>

</HTML>

Answer 1

您不使用致电rotateToPosition的返回值。我怀疑它应该读起来像

cipherAlphabet = rotateToPosition(signalCharacter, indexCharacter, plainAlphabet, cipherAlphabet);

插件：[{1}}功能未考虑rotateToPosition。应该纠正这样做：

signalCharacter

函数内的函数不起作用

1 个答案: