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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>凱撒密碼</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" type="text/css" media="screen" href="main.css" />
<style>
table#respond {
border-collapse: collapse;
width: 50%;
}
td#respond,th#respond {
border: 1px solid #dddddd;
text-align: left;
padding: 3px;
}
tr:nth-child(even) {
background-color: #dddddd;
}
td:nth-child(even) {
text-align: center;
padding: 8px;
}
</style>
</head>
<body>
<h1>Caesar encryption</h1>
<form name="caesar_encryption">
請輸入想加/解密的文字：<br>
<input type="text" name="original_text">
</form>
<br>
<input type="button" value="start ROT" onClick="do_caesar()">
<br>
<br>
<table id=respond></table>
<script>
function do_caesar() {
var ROT = [];
var output_text = ["<tr><td>偏移量</td><td>Text</td></tr>"];
var key, j, word_text, cword;
var original_text = document.caesar_encryption.original_text.value;
for (key = 0; key < 26; key++) {
var answer = "";
for (now_word = 0; now_word < original_text.length; now_word++) {
word_text = original_text.charCodeAt(now_word);
if (word_text >= 65 && word_text <= 90) {
cword = ((word_text - 65) + key) % 26 + 65;
}
if (word_text >= 97 && word_text <= 122) {
cword = ((word_text - 97) + key) % 26 + 97;
}
if (word_text == 32) {
cword = word_text;
}
answer += String.fromCharCode(cword);
}
ROT.push(answer);
answer = "";
}
ROT.forEach(function (index, element) {
output_text += "<tr>" + "<td>" + "ROT" + element + "</td>" + "<td>" + index + "</td>" + "</tr>";
})
document.getElementById("respond").innerHTML = output_text;
}
</script>
</body>
</html>