76 lines
2.0 KiB
Markdown
76 lines
2.0 KiB
Markdown
---
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id: 587d7fb5367417b2b2512c03
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title: 用脱字符(^)来使用依赖项的最新次要版本
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challengeType: 2
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forumTopicId: 301531
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dashedName: use-the-caret-character-to-use-the-latest-minor-version-of-a-dependency
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---
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# --description--
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和上一个挑战中我们学到的用波浪号来安装最新的修订版依赖一样,脱字符(`^`)也允许 npm 来安装功能更新。 它们的不同之处在于:脱字符允许次版本和修订版更新。
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现在项目中的 moment 依赖包的版本应该是“~2.10.2”,这意味着 npm 可以安装最新的 2.10.x 版的 moment, 如果使用脱字符(^)来替换版本号的前缀,那么 npm 可以将 moment 升级安装到任何 2.x.x 的版本。
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```json
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"package": "^1.3.8"
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```
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这会将依赖包更新到任意的 1.x.x 版本。
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# --instructions--
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在依赖项中,使用脱字符(`^`)为 moment 的版本添加前缀,允许 npm 更新依赖包到任意新的次版本。
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**注意:**原来的版本号不用更改。
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# --hints--
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“dependencies”字段中应包含“moment”
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/_api/package.json').then(
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(data) => {
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var packJson = JSON.parse(data);
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assert.property(
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packJson.dependencies,
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'moment',
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'"dependencies" does not include "moment"'
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);
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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“moment”的版本应是“^2.x.x”
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```js
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(getUserInput) =>
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$.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\./,
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'Wrong version of "moment". It should be ^2.10.2'
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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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