---
title: Factors of an integer
id: 597f1e7fbc206f0e9ba95dc4
challengeType: 5
videoUrl: ''
localeTitle: 整数因子
---

## Description
<section id="description"><p>编写一个返回正整数因子的函数。 </p><p>这些因子是正整数，通过该正整数可以将被分解的数量除以产生正整数结果。 </p> /// </section>

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

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>factors</code>是一种功能。
    testString: assert(typeof factors === 'function');
  - text: '<code>factors(45)</code>应该返回<code>[1,3,5,9,15,45]</code> 。'
    testString: assert.deepEqual(factors(45), ans[0]);
  - text: '<code>factors(53)</code>应该返回<code>[1,53]</code> 。'
    testString: assert.deepEqual(factors(53), ans[1]);
  - text: '<code>factors(64)</code>应该返回<code>[1,2,4,8,16,32,64]</code> 。'
    testString: assert.deepEqual(factors(64), ans[2]);

```

</section>

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

<div id='js-seed'>

```js
function factors (num) {
  // Good luck!
}

```

</div>


### After Test
<div id='js-teardown'>

```js
console.info('after the test');
```

</div>

</section>

## Solution
<section id='solution'>

```js
// solution required
```

/section>