---
id: cf1111c1c11feddfaeb4bdef
title: Subtract One Number from Another with JavaScript
challengeType: 1
videoUrl: ''
localeTitle: 使用JavaScript从另一个数字中减去一个数字
---

## Description
<section id="description">我们也可以从另一个数字中减去一个数字。 JavaScript使用<code>-</code>符号进行减法。 <p> <strong>例</strong> </p><blockquote> myVar = 12  -  6; //分配6 </blockquote></section>

## Instructions
<section id="instructions">更改<code>0</code>因此差异为<code>12</code> 。 </section>

## Tests
<section id='tests'>

```yml
tests:
  - text: ''
    testString: 'assert(difference === 12, "Make the variable <code>difference</code> equal 12.");'
  - text: 只从45中减去一个数字。
    testString: 'assert(/var\s*difference\s*=\s*45\s*-\s*[0-9]*;(?!\s*[a-zA-Z0-9]+)/.test(code),"Only subtract one number from 45.");'

```

</section>

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

<div id='js-seed'>

```js
var difference = 45 - 0;

```

</div>


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

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

</div>

</section>

## Solution
<section id='solution'>

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