freeCodeCamp/curriculum/challenges/chinese/08-coding-interview-prep/rosetta-code/sedols.chinese.md

---
title: SEDOLs
id: 59d9c6bc214c613ba73ff012
challengeType: 5
videoUrl: ''
localeTitle: SEDOLs
---

## Description
<section id="description">任务： <p>对于6位<a href="https://en.wikipedia.org/wiki/SEDOL" title="wp：SEDOL">SEDOL</a>的每个数字列表，计算并附加校验和数字。 </p><p>也就是说，给定左侧的输入字符串，您的函数应返回右侧的相应字符串： </p><pre> <code>&lt;pre&gt; 710889 =&gt; 7108899 B0YBKJ =&gt; B0YBKJ7 406566 =&gt; 4065663 B0YBLH =&gt; B0YBLH2 228276 =&gt; 2282765 B0YBKL =&gt; B0YBKL9 557910 =&gt; 5579107 B0YBKR =&gt; B0YBKR5 585284 =&gt; 5852842 B0YBKT =&gt; B0YBKT7 B00030 =&gt; B000300 &lt;/pre&gt;</code> </pre><p>还要检查每个输入是否正确形成，尤其是对于SEDOL字符串中允许的有效字符。您的函数应在无效输入时返回<code>null</code> 。 </p></section>

## Instructions
<section id="instructions">
</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>sedol</code>是一个功能。
    testString: 'assert(typeof sedol === "function", "<code>sedol</code> is a function.");'
  - text: '<code>sedol(&#39;a&#39;)</code>应该返回null。“）'
    testString: 'assert(sedol("a") === null, "<code>sedol("a")</code> should return null.");'
  - text: '<code>sedol(&#39;710889&#39;)</code>应返回&#39;7108899&#39;。“）'
    testString: 'assert(sedol("710889") === "7108899", "<code>sedol("710889")</code> should return "7108899".");'
  - text: '<code>sedol(&#39;BOATER&#39;)</code>应该返回null。“）'
    testString: 'assert(sedol("BOATER") === null, "<code>sedol("BOATER")</code> should return null.");'
  - text: '<code>sedol(&#39;228276&#39;)</code>应该返回&#39;2282765&#39;。“）'
    testString: 'assert(sedol("228276") === "2282765", "<code>sedol("228276")</code> should return "2282765".");'

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='js-seed'>

```js
function sedol (input) {
  // Good luck!
  return true;
}

```

</div>



</section>

## Solution
<section id='solution'>

```js
// solution required
```
</section>