mirror of https://github.com/jkjoy/sunpeiwen.git
187 lines
5.7 KiB
Markdown
187 lines
5.7 KiB
Markdown
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# Mime
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A comprehensive, compact MIME type module.
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[](https://travis-ci.org/broofa/mime)
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## Version 2 Notes
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Version 2 is a breaking change from 1.x as the semver implies. Specifically:
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* `lookup()` renamed to `getType()`
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* `extension()` renamed to `getExtension()`
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* `charset()` and `load()` methods have been removed
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If you prefer the legacy version of this module please `npm install mime@^1`. Version 1 docs may be found [here](https://github.com/broofa/mime/tree/v1.4.0).
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## Install
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### NPM
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```
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npm install mime
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```
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### Browser
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It is recommended that you use a bundler such as
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[webpack](https://webpack.github.io/) or [browserify](http://browserify.org/) to
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package your code. However, browser-ready versions are available via wzrd.in.
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E.g. For the full version:
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<script src="https://wzrd.in/standalone/mime@latest"></script>
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<script>
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mime.getType(...); // etc.
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</script>
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Or, for the `mime/lite` version:
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<script src="https://wzrd.in/standalone/mime%2flite@latest"></script>
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<script>
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mimelite.getType(...); // (Note `mimelite` here)
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</script>
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## Quick Start
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For the full version (800+ MIME types, 1,000+ extensions):
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```javascript
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const mime = require('mime');
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mime.getType('txt'); // ⇨ 'text/plain'
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mime.getExtension('text/plain'); // ⇨ 'txt'
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```
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See [Mime API](#mime-api) below for API details.
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## Lite Version
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There is also a "lite" version of this module that omits vendor-specific
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(`*/vnd.*`) and experimental (`*/x-*`) types. It weighs in at ~2.5KB, compared
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to 8KB for the full version. To load the lite version:
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```javascript
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const mime = require('mime/lite');
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```
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## Mime .vs. mime-types .vs. mime-db modules
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For those of you wondering about the difference between these [popular] NPM modules,
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here's a brief rundown ...
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[`mime-db`](https://github.com/jshttp/mime-db) is "the source of
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truth" for MIME type information. It is not an API. Rather, it is a canonical
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dataset of mime type definitions pulled from IANA, Apache, NGINX, and custom mappings
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submitted by the Node.js community.
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[`mime-types`](https://github.com/jshttp/mime-types) is a thin
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wrapper around mime-db that provides an API drop-in compatible(ish) with `mime @ < v1.3.6` API.
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`mime` is, as of v2, a self-contained module bundled with a pre-optimized version
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of the `mime-db` dataset. It provides a simplified API with the following characteristics:
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* Intelligently resolved type conflicts (See [mime-score](https://github.com/broofa/mime-score) for details)
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* Method naming consistent with industry best-practices
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* Compact footprint. E.g. The minified+compressed sizes of the various modules:
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Module | Size
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--- | ---
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`mime-db` | 18 KB
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`mime-types` | same as mime-db
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`mime` | 8 KB
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`mime/lite` | 2 KB
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## Mime API
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Both `require('mime')` and `require('mime/lite')` return instances of the MIME
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class, documented below.
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Note: Inputs to this API are case-insensitive. Outputs (returned values) will
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be lowercase.
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### new Mime(typeMap, ... more maps)
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Most users of this module will not need to create Mime instances directly.
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However if you would like to create custom mappings, you may do so as follows
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...
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```javascript
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// Require Mime class
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const Mime = require('mime/Mime');
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// Define mime type -> extensions map
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const typeMap = {
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'text/abc': ['abc', 'alpha', 'bet'],
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'text/def': ['leppard']
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};
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// Create and use Mime instance
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const myMime = new Mime(typeMap);
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myMime.getType('abc'); // ⇨ 'text/abc'
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myMime.getExtension('text/def'); // ⇨ 'leppard'
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```
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If more than one map argument is provided, each map is `define()`ed (see below), in order.
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### mime.getType(pathOrExtension)
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Get mime type for the given path or extension. E.g.
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```javascript
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mime.getType('js'); // ⇨ 'application/javascript'
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mime.getType('json'); // ⇨ 'application/json'
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mime.getType('txt'); // ⇨ 'text/plain'
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mime.getType('dir/text.txt'); // ⇨ 'text/plain'
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mime.getType('dir\\text.txt'); // ⇨ 'text/plain'
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mime.getType('.text.txt'); // ⇨ 'text/plain'
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mime.getType('.txt'); // ⇨ 'text/plain'
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```
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`null` is returned in cases where an extension is not detected or recognized
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```javascript
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mime.getType('foo/txt'); // ⇨ null
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mime.getType('bogus_type'); // ⇨ null
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```
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### mime.getExtension(type)
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Get extension for the given mime type. Charset options (often included in
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Content-Type headers) are ignored.
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```javascript
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mime.getExtension('text/plain'); // ⇨ 'txt'
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mime.getExtension('application/json'); // ⇨ 'json'
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mime.getExtension('text/html; charset=utf8'); // ⇨ 'html'
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```
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### mime.define(typeMap[, force = false])
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Define [more] type mappings.
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`typeMap` is a map of type -> extensions, as documented in `new Mime`, above.
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By default this method will throw an error if you try to map a type to an
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extension that is already assigned to another type. Passing `true` for the
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`force` argument will suppress this behavior (overriding any previous mapping).
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```javascript
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mime.define({'text/x-abc': ['abc', 'abcd']});
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mime.getType('abcd'); // ⇨ 'text/x-abc'
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mime.getExtension('text/x-abc') // ⇨ 'abc'
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```
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## Command Line
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mime [path_or_extension]
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E.g.
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> mime scripts/jquery.js
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application/javascript
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----
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Markdown generated from [src/README_js.md](src/README_js.md) by [](https://github.com/broofa/runmd) |