forked from zhurui/management
51 lines
2.3 KiB
Markdown
51 lines
2.3 KiB
Markdown
# events [](https://travis-ci.org/Gozala/events)
|
|
|
|
> Node's event emitter for all engines.
|
|
|
|
This implements the Node.js [`events`][node.js docs] module for environments that do not have it, like browsers.
|
|
|
|
> `events` currently matches the **Node.js 11.13.0** API.
|
|
|
|
Note that the `events` module uses ES5 features. If you need to support very old browsers like IE8, use a shim like [`es5-shim`](https://www.npmjs.com/package/es5-shim). You need both the shim and the sham versions of `es5-shim`.
|
|
|
|
This module is maintained, but only by very few people. If you'd like to help, let us know in the [Maintainer Needed](https://github.com/Gozala/events/issues/43) issue!
|
|
|
|
## Install
|
|
|
|
You usually do not have to install `events` yourself! If your code runs in Node.js, `events` is built in. If your code runs in the browser, bundlers like [browserify](https://github.com/browserify/browserify) or [webpack](https://github.com/webpack/webpack) also include the `events` module.
|
|
|
|
But if none of those apply, with npm do:
|
|
|
|
```
|
|
npm install events
|
|
```
|
|
|
|
## Usage
|
|
|
|
```javascript
|
|
var EventEmitter = require('events')
|
|
|
|
var ee = new EventEmitter()
|
|
ee.on('message', function (text) {
|
|
console.log(text)
|
|
})
|
|
ee.emit('message', 'hello world')
|
|
```
|
|
|
|
## API
|
|
|
|
See the [Node.js EventEmitter docs][node.js docs]. `events` currently matches the Node.js 11.13.0 API.
|
|
|
|
## Contributing
|
|
|
|
PRs are very welcome! The main way to contribute to `events` is by porting features, bugfixes and tests from Node.js. Ideally, code contributions to this module are copy-pasted from Node.js and transpiled to ES5, rather than reimplemented from scratch. Matching the Node.js code as closely as possible makes maintenance simpler when new changes land in Node.js.
|
|
This module intends to provide exactly the same API as Node.js, so features that are not available in the core `events` module will not be accepted. Feature requests should instead be directed at [nodejs/node](https://github.com/nodejs/node) and will be added to this module once they are implemented in Node.js.
|
|
|
|
If there is a difference in behaviour between Node.js's `events` module and this module, please open an issue!
|
|
|
|
## License
|
|
|
|
[MIT](./LICENSE)
|
|
|
|
[node.js docs]: https://nodejs.org/dist/v11.13.0/docs/api/events.html
|