Let's talk about four ways to get parameters in Nodejs

This article will introduce to you NodejsFour ways to obtain parameters. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

Recommended study: "nodejs tutorial"

Obtaining the parameters in the request is a must for every web background processing Road, nodejs's express framework provides four methods to achieve this.

• req.body

• req.query

• req.params

• req.param()

First introduce the first req.body

官方文档解释：
Contains key-value pairs of data submitted in the request body. By default, it is undefined,
 and is populated when you use body-parsing middleware such as body-parser and multer.

稍微翻译一下：包含了提交数据的键值对在请求的body中，默认是underfined,
你可以用body-parser或者multer来解析body

Parsing body is not nodejs default Provided, you need to load the body-parser middleware before you can use req.body

This method is usually used to parse the data in the POST request

The second type is req.query

官方文档解释：
An object containing a property for each query string parameter in the route. 
If there is no query string, it is the empty object, {}.
翻译一下:包含在路由中每个查询字符串参数属性的对象。如果没有，默认为{}

Nodejs provides it by default, no need to load middleware

Example (official excerpt ):

// GET /search?q=tobi+ferret
req.query.q
// => "tobi ferret"

// GET /shoes?order=desc&shoe[color]=blue&shoe[type]=converse
req.query.order
// => "desc"
req.query.shoe.color
// => "blue"
req.query.shoe.type
// => "converse"

This method is mostly suitable for GET requests, parsing the parameters in GET

Three are req.params

官方文档：
An object containing properties mapped to the named route “parameters”. 
For example, if you have the route /user/:name, 
then the “name” property is available as req.params.name. This object defaults to {}.

翻译：包含映射到指定的路线“参数”属性的对象。
例如，如果你有route/user/：name，那么“name”属性可作为req.params.name。
该对象默认为{}。

nodejs provides it by default, no need to load other middleware

Example

// GET /user/tj
req.params.name
// => "tj"

More suitable for parsing parameters in restful style URLs

The difference between req.query and req.params

req.params contains routing parameters (in the path part of the URL), while req.query contains the query parameters of the URL (the parameters after the ? in the URL).

The last req.param()

This method is deprecated, please see the official explanation

Deprecated. Use either req.params, req.body or req.query, as applicable.
翻译：被弃用，用其他三种方式替换

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