mirror of https://github.com/jkjoy/sunpeiwen.git
51 lines
2.3 KiB
Markdown
51 lines
2.3 KiB
Markdown
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# events [](https://travis-ci.org/Gozala/events)
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> Node's event emitter for all engines.
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This implements the Node.js [`events`][node.js docs] module for environments that do not have it, like browsers.
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> `events` currently matches the **Node.js 11.13.0** API.
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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`.
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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!
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## Install
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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.
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But if none of those apply, with npm do:
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```
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npm install events
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```
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## Usage
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```javascript
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var EventEmitter = require('events')
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var ee = new EventEmitter()
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ee.on('message', function (text) {
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console.log(text)
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})
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ee.emit('message', 'hello world')
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```
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## API
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See the [Node.js EventEmitter docs][node.js docs]. `events` currently matches the Node.js 11.13.0 API.
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## Contributing
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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.
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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.
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If there is a difference in behaviour between Node.js's `events` module and this module, please open an issue!
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## License
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[MIT](./LICENSE)
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[node.js docs]: https://nodejs.org/dist/v11.13.0/docs/api/events.html
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