78 lines
1.9 KiB
Markdown
78 lines
1.9 KiB
Markdown
---
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id: 587d7fb4367417b2b2512c00
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title: 使用 npm 的外部包扩展项目
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challengeType: 2
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forumTopicId: 301527
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dashedName: expand-your-project-with-external-packages-from-npm
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---
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# --description--
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强大的依赖管理特性是使用包管理器的最大原因之一。 每当在新的计算机上开始一个项目时，无需手动，npm 会自动安装所有的依赖项。 但是 npm 如何准确地知道项目需要哪些依赖呢？ 来看看 package.json 文件中 `dependencies` 这一部分。
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在这部分，你的项目需要按照下面这种格式来存储依赖包：
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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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# --instructions--
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在 package.json 文件的 `dependencies` 字段中添加一个版本号为“2.14.0”的“moment”包。
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**注意：** Moment 是一个非常方便地用来处理时间和日期的库。
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# --hints--
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“dependencies”字段应该包含“moment”
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/package.json').then(
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(data) => {
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var packJson = JSON.parse(data);
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assert.property(
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packJson.dependencies,
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'moment',
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'"dependencies" does not include "moment"'
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);
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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“moment”的版本应该是“2.14.0”
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/package.json').then(
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(data) => {
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var packJson = JSON.parse(data);
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assert.match(
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packJson.dependencies.moment,
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/^[\^\~]?2\.14\.0/,
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'Wrong version of "moment" installed. It should be 2.14.0'
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);
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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# --solutions--
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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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