60 lines
1.9 KiB
Markdown
60 lines
1.9 KiB
Markdown
---
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id: 587d7fb4367417b2b2512c00
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challengeType: 2
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forumTopicId: 301527
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title: 使用 npm 的外部软件包扩展您的项目
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---
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## Description
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<section id='description'>
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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。
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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：
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```json
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"dependencies": {
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"package-name": "version",
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"express": "4.14.0"
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}
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```
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</section>
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## Instructions
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<section id='instructions'>
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在 package.json 的 dependencies 字段中添加一个版本号为 2.14.0 的 moment 包。
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Moment 是一个非常方便的库，它用来处理时间和日期。
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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: "'dependencies' 应该包含 'moment'。"
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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); })'
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- text: "'moment' 的版本应该是 '2.14.0'。"
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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); })'
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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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</section>
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## Solution
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<section id='solution'>
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```js
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/**
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Backend challenges don't need solutions,
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because they would need to be tested against a full working project.
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Please check our contributing guidelines to learn more.
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*/
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```
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</section>
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