64 lines
2.7 KiB
Markdown
64 lines
2.7 KiB
Markdown
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---
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id: 56533eb9ac21ba0edf2244e2
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title: Caesars Cipher
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challengeType: 5
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isRequired: true
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videoUrl: ''
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localeTitle: 凯撒密码
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---
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## Description
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<section id="description">最简单和最广为人知的<dfn>密码之一</dfn>是<code>Caesar cipher</code> ，也称为<code>shift cipher</code> 。在<code>shift cipher</code>中，字母的含义被移动一些设定量。一种常见的现代用途是<a href="https://en.wikipedia.org/wiki/ROT13" target="_blank">ROT13</a>密码，其中字母的值移动了13个位置。因此'A'''N'，'B'''O'等等。编写一个函数，它将<a href="https://en.wikipedia.org/wiki/ROT13" target="_blank">ROT13</a>编码的字符串作为输入并返回一个已解码的字符串。所有字母都是大写的。不要转换任何非字母字符（即空格，标点符号），但要传递它们。如果卡住，请记得使用<a href="http://forum.freecodecamp.org/t/how-to-get-help-when-you-are-stuck/19514" target="_blank">Read-Search-Ask</a> 。尝试配对程序。编写自己的代码。 </section>
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## Instructions
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<section id="instructions">
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: <code>rot13("SERR PBQR PNZC")</code>应解码为<code>FREE CODE CAMP</code>
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testString: 'assert(rot13("SERR PBQR PNZC") === "FREE CODE CAMP", "<code>rot13("SERR PBQR PNZC")</code> should decode to <code>FREE CODE CAMP</code>");'
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- text: <code>rot13("SERR CVMMN!")</code>应该解码为<code>FREE PIZZA!</code> <code>rot13("SERR CVMMN!")</code> <code>FREE PIZZA!</code>
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testString: 'assert(rot13("SERR CVMMN!") === "FREE PIZZA!", "<code>rot13("SERR CVMMN!")</code> should decode to <code>FREE PIZZA!</code>");'
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- text: <code>rot13("SERR YBIR?")</code>应解码为<code>FREE LOVE?</code>
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testString: 'assert(rot13("SERR YBIR?") === "FREE LOVE?", "<code>rot13("SERR YBIR?")</code> should decode to <code>FREE LOVE?</code>");'
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- text: <code>rot13("GUR DHVPX OEBJA SBK WHZCF BIRE GUR YNML QBT.")</code>应该在<code>rot13("GUR DHVPX OEBJA SBK WHZCF BIRE GUR YNML QBT.")</code>解码到<code>THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.</code>
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testString: 'assert(rot13("GUR DHVPX OEBJA SBK WHZCF BIRE GUR YNML QBT.") === "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.", "<code>rot13("GUR DHVPX OEBJA SBK WHZCF BIRE GUR YNML QBT.")</code> should decode to <code>THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.</code>");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function rot13(str) { // LBH QVQ VG!
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return str;
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}
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// Change the inputs below to test
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rot13("SERR PBQR PNZC");
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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