koa中使用的模塊

本文轉載自查看原文 2015-02-28 20:11 2112 依賴/ npm/ 模塊/ nodejs/ koa

今天開始學習目前呼聲很高的koa模塊，不過目前使用koa還是要用--harmony-generator標識，即便在剛出的nodejs 12上也是如此~，io.js倒是不需要，去年的nodejs和iojs分派不知道會不會帶來什么大的變革，不過既然koa目前呼聲這么高，肯定有他值得學習的地方，所以先搞着吧，多學點總比不學好。

這篇文章把koa依賴的模塊列舉一下，以后再自己學習koa的過程中減少一點查詢的過程，也算是nodejs打基礎的第一步吧~

accepts

Higher level content negotiation based on negotiator. Extracted from koa for general use. In addition to negotiator, it allows:

Allows types as an array or arguments list, ie (['text/html', 'application/json']) as well as ('text/html', 'application/json').

Allows type shorthands such as json.

Returns false when no types match

Treats non-existent headers as *

一個比較高級的API用來http處理請求中的接受類型，比如：判斷請求可接收的類型

這個本身包含在koa里面的，現在是提取出來可以作為其他用途

https://www.npmjs.com/package/accepts

co

Generator based control flow goodness for nodejs and the browser, using promises, letting you write non-blocking code in a nice-ish way.

基於generator語法的控制流，koa的generator就是來自這個？

https://www.npmjs.com/package/co

Composition

Compose generator and async/await middleware like koa. Allows to use both generator functions and async/await functions.

撰寫跟koa風格一致的代碼，koa包含這個。。。傻傻分不清楚

https://www.npmjs.com/package/composition

Content-Disposition

Create and parse HTTP Content-Disposition header

貌似用於文件下載的時候自動適配文件的類型把類型寫入Content-Type

https://www.npmjs.com/package/content-disposition

~~2015-2-27保存草稿...明天繼續~~

content-type

Create and parse HTTP Content-Type header according to RFC 7231

用來處理Content-Type頭信息的

https://www.npmjs.com/package/content-type

cookie is a basic cookie parser and serializer. It doesn't make assumptions about how you are going to deal with your cookies. It basically just provides a way to read and write the HTTP cookie headers.

See RFC6265 for details about the http header for cookies.

只是提供一個讀寫cookie的API

https://www.npmjs.com/package/cookie

debug

tiny node.js debugging utility modelled after node core's debugging technique.

貌似就是一個封裝的打印log的小東西？待研究~

https://www.npmjs.com/package/debug

delegates

Node method and accessor delegation utilty.

代理？不明，待研究

https://www.npmjs.com/package/delegates

destroy

Destroy a stream.

用來摧毀一個strem對象

https://www.npmjs.com/package/destroy

error-inject

inject an error listener into a stream

給stream對象注入一個錯誤監聽

https://www.npmjs.com/package/error-inject

escape-html

Escape HTML entities

這個。。。顧名思義了，跟前端的escape一個意思

https://www.npmjs.com/package/escape-html

fresh

HTTP response freshness testing

貌似是一個根據Etag來判斷是否cache的東西，如果是cache的就直接返回304

https://www.npmjs.com/package/fresh

http-assert

Assert with status codes. Like ctx.throw() in Koa, but with a guard.

通過狀態碼進行斷言？猜測是用來判斷請求狀態的，全部代碼只有33行...

https://www.npmjs.com/package/http-assert

http-errors

Create HTTP errors for Express, Koa, Connect, etc. with ease.

又是一個從koa里面分離出去的模塊，主要作用是用來簡單得創建http錯誤信息

https://www.npmjs.com/package/http-errors

mime-types

The ultimate javascript content-type utility.

Similar to node-mime, except:

No fallbacks. Instead of naively returning the first available type, mime-types simply returns false, so do var type = mime.lookup('unrecognized') || 'application/octet-stream'.

No new Mime() business, so you could do var lookup = require('mime-types').lookup.

Additional mime types are added such as jade and stylus via mime-db

No .define() functionality

Otherwise, the API is compatible.

最終版的MIME幫助API，重新定義了API實現，更加方便，也更加健全

https://www.npmjs.com/package/mime-types