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I mentioned how the Request object holds all the HTTP request information.
我提到了Request对象如何保存所有HTTP请求信息。
These are the main properties you’ll likely use:
这些是您可能会使用的主要属性：
| Property | Description |
|---|---|
| .app | holds a reference to the Express app object |
| .baseUrl | the base path on which the app responds |
| .body | contains the data submitted in the request body (must be parsed and populated manually before you can access it) |
| .cookies | contains the cookies sent by the request (needs the cookie-parser middleware) |
| .hostname | the hostname as defined in the value |
| .ip | the client IP |
| .method | the HTTP method used |
| .params | the route named parameters |
| .path | the URL path |
| .protocol | the request protocol |
| .query | an object containing all the query strings used in the request |
| .secure | true if the request is secure (uses HTTPS) |
| .signedCookies | contains the signed cookies sent by the request (needs the cookie-parser middleware) |
| .xhr | true if the request is an |
| 属性 | 描述 |
|---|---|
| .app | 持有对Express应用程序对象的引用 |
| .baseUrl | 应用程序响应的基本路径 |
| 。身体 | 包含在请求正文中提交的数据(必须先对其进行解析和填充，然后才能访问它) |
| 。饼干 | 包含请求发送的cookie-parser (需要cookie-parser中间件) |
| 。主机名 | 值中定义的名 |
| .ip | 客户端IP |
| 。方法 | 使用的HTTP方法 |
| .params | 路线命名参数 |
| 。路径 | URL路径 |
| 。协议 | 请求协议 |
| 。查询 | 包含请求中使用的所有查询字符串的对象 |
| 。安全 | 如果请求是安全的(使用HTTPS)，则为true |
| .signedCookies | 包含请求发送的签名cookie(需要cookie-parser中间件) |
| .xhr | 如果请求是则返回true |
The query string is the part that comes after the URL path, and starts with a question mark ?.
查询字符串是URL路径之后的部分，并以问号?开头? 。
Example:
例：
?name=flavio
Multiple query parameters can be added using &:
可以使用&添加多个查询参数：
?name=flavio&age=35
How do you get those query string values in Express?
如何在Express中获取那些查询字符串值？
Express makes it very easy by populating the Request.query object for us:
Express通过为我们填充Request.query对象使它变得非常容易：
const express = require('express')const app = express()app.get('/', (req, res) => { console.log(req.query)})app.listen(8080) This object is filled with a property for each query parameter.
该对象由每个查询参数的属性填充。
If there are no query params, it’s an empty object.
如果没有查询参数，则为空对象。
This makes it easy to iterate on it using the for…in loop:
这使得使用for…in循环可以很容易地对其进行迭代：
for (const key in req.query) { console.log(key, req.query[key])} This will print the query property key and the value.
这将打印查询属性键和值。
You can access single properties as well:
您还可以访问单个属性：
req.query.name //flavioreq.query.age //35
POST query parameters are sent by HTTP clients for example by forms, or when performing a POST request sending data.
POST查询参数由HTTP客户端(例如，通过表单)发送，或在执行POST请求发送数据时发送。
How can you access this data?
您如何访问此数据？
If the data was sent as , using Content-Type: application/json, you will use the express.json() middleware:
如果使用Content-Type: application/json将数据作为发送，则将使用express.json()中间件：
const express = require('express')const app = express()app.use(express.json()) If the data was sent using Content-Type: application/x-www-form-urlencoded, you will need to use the express.urlencoded() middleware:
如果数据是使用Content-Type: application/x-www-form-urlencoded ，则需要使用express.urlencoded()中间件：
const express = require('express')const app = express()app.use(express.urlencoded({ extended: true})) In both cases you can access the data by referencing it from Request.body:
在这两种情况下，都可以通过从Request.body引用数据来访问数据：
app.post('/form', (req, res) => { const name = req.body.name}) Note: older Express versions required the use of the
body-parsermodule to process POST data. This is no longer the case as of Express 4.16 (released in September 2017) and later versions.注意：较早的Express版本需要使用
body-parser模块来处理POST数据。 从Express 4.16(2017年9月发布)和更高版本开始不再如此。
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