Created
April 29, 2019 23:49
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| export default class PubSub { | |
| constructor() { | |
| this.registry = {}; | |
| } | |
| on(evtName, cb) { | |
| this.registry[evtName] = this.registry[evtName] || []; | |
| this.registry[evtName].push(cb); | |
| } | |
| off(evtName, cb) { | |
| if (this.registry[evtName]) { | |
| for (let i = 0; i < this.registry[evtName].length; i++) { | |
| if (this.registry[evtName][i] === cb) { | |
| this.registry[evtName].splice(i, 1); | |
| break; | |
| } | |
| } | |
| } | |
| } | |
| emit(evtName, data) { | |
| if (this.registry[evtName]) { | |
| this.registry[evtName].forEach(cb => cb(data)); | |
| } | |
| } | |
| } |
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