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freeCodeCamp/curriculum/challenges/chinese/05-apis-and-microservices/managing-packages-with-npm/expand-your-project-with-external-packages-from-npm.md

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---
id: 587d7fb4367417b2b2512c00
challengeType: 2
forumTopicId: 301527
2020-10-01 17:54:21 +02:00
title: 使用 npm 的外部软件包扩展您的项目
---
## Description
<section id='description'>
使用包管理器的最大原因之一是它们强大的依赖管理特性。在新的计算机上开始一个项目时不用手动确认你已安装所有的依赖npm 会自动为你安装它们。但是 npm 如何准确的知道你项目需要哪些依赖呢?我们来看看 package.json 中 dependencies 这一部分。
在 dependencies 这一部分,你的项目需要按照下面这种格式来存储这些依赖包:
```json
"dependencies": {
"package-name": "version",
"express": "4.14.0"
}
```
</section>
## Instructions
<section id='instructions'>
在 package.json 的 dependencies 字段中添加一个版本号为 2.14.0 的 moment 包。
Moment 是一个非常方便的库,它用来处理时间和日期。
</section>
## Tests
<section id='tests'>
```yml
tests:
- text: "'dependencies' 应该包含 'moment'。"
testString: 'getUserInput => $.get(getUserInput(''url'') + ''/_api/package.json'').then(data => { var packJson = JSON.parse(data); assert.property(packJson.dependencies, ''moment'', ''"dependencies" does not include "moment"''); }, xhr => { throw new Error(xhr.responseText); })'
- text: "'moment' 的版本应该是 '2.14.0'。"
testString: 'getUserInput => $.get(getUserInput(''url'') + ''/_api/package.json'').then(data => { var packJson = JSON.parse(data); assert.match(packJson.dependencies.moment, /^[\^\~]?2\.14\.0/, ''Wrong version of "moment" installed. It should be 2.14.0''); }, xhr => { throw new Error(xhr.responseText); })'
```
</section>
## Challenge Seed
<section id='challengeSeed'>
</section>
## Solution
<section id='solution'>
```js
/**
Backend challenges don't need solutions,
because they would need to be tested against a full working project.
Please check our contributing guidelines to learn more.
*/
```
</section>