2019-05-06 07:31:26 -04:00
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---
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id: 587d7fb4367417b2b2512c00
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2020-12-16 00:37:30 -07:00
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title: 使用 npm 的外部软件包扩展您的项目
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2019-05-06 07:31:26 -04:00
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challengeType: 2
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2020-09-18 00:12:32 +08:00
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forumTopicId: 301527
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2021-01-13 03:31:00 +01:00
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dashedName: expand-your-project-with-external-packages-from-npm
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2019-05-06 07:31:26 -04:00
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---
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2020-12-16 00:37:30 -07:00
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# --description--
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2020-09-18 00:12:32 +08:00
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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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2020-12-16 00:37:30 -07:00
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2020-09-18 00:12:32 +08:00
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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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2020-12-16 00:37:30 -07:00
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# --instructions--
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2019-05-06 07:31:26 -04:00
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2020-09-18 00:12:32 +08:00
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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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2020-12-16 00:37:30 -07:00
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2020-09-18 00:12:32 +08:00
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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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2019-05-06 07:31:26 -04:00
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2020-12-16 00:37:30 -07:00
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# --hints--
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2019-05-06 07:31:26 -04:00
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2020-12-16 00:37:30 -07:00
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'dependencies' 应该包含 'moment'。
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2019-05-06 07:31:26 -04:00
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2020-12-16 00:37:30 -07:00
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/package.json').then(
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(data) => {
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var packJson = JSON.parse(data);
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assert.property(
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packJson.dependencies,
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'moment',
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'"dependencies" does not include "moment"'
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);
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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2019-05-06 07:31:26 -04:00
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```
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2020-12-16 00:37:30 -07:00
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'moment' 的版本应该是 '2.14.0'。
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2019-05-06 07:31:26 -04:00
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```js
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2020-12-16 00:37:30 -07:00
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(getUserInput) =>
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$.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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2019-05-06 07:31:26 -04:00
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```
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2020-08-13 17:24:35 +02:00
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2020-12-16 00:37:30 -07:00
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# --solutions--
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2021-01-13 03:31:00 +01:00
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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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