66 lines
2.0 KiB
Markdown
66 lines
2.0 KiB
Markdown
---
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id: 587d7fb2367417b2b2512bf5
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title: 从客户端获取输入的路由参数
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challengeType: 2
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forumTopicId: 301513
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dashedName: get-route-parameter-input-from-the-client
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---
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# --description--
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在构建 API 时,要让用户告诉我们他们想从服务中获取什么。 举个例子,如果客户请求数据库中存储的用户信息,他们需要一种方法让我们知道他们对哪个用户感兴趣, 使用路由参数可以实现这个需求。 路由参数是由斜杠(/)分隔的 URL 命名段, 每一小段能捕获与其位置匹配的 URL 部分的值, 捕获的值能够在 `req.params` 对象中找到。
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<blockquote>路由地址:'/user/:userId/book/:bookId'<br> 实际请求 URL:'/user/546/book/6754'<br> req.params:{userId: '546', bookId: '6754'}</blockquote>
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# --instructions--
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在路由 `GET /:word/echo` 中构建一个响应服务, 响应一个采用 `{echo: word}` 结构的 JSON 对象。 可以在 `req.params.word` 中找到要重复的单词, 可以在浏览器的地址栏测试你的路由,访问一些匹配的路由,比如:`your-app-rootpath/freecodecamp/echo`。
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# --hints--
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测试 1:你的 echo 服务应该正确地重复单词
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/eChOtEsT/echo').then(
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(data) => {
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assert.equal(
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data.echo,
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'eChOtEsT',
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'Test 1: the echo server is not working as expected'
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);
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},
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(xhr) => {
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throw new Error(xhr.responseText);
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}
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);
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```
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测试 2:你的 echo 服务应该正确地重复单词
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```js
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(getUserInput) =>
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$.get(getUserInput('url') + '/ech0-t3st/echo').then(
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(data) => {
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assert.equal(
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data.echo,
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'ech0-t3st',
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'Test 2: the echo server is not working as expected'
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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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