class EventBus { constructor() { this.cache = {} } on(name, func) { if (this.cache[name]) { this.cache[name].push(func) } else { this.cache[name] = [func] } } emit(name, params) { if (this.cache[name]) { const tasks = this.cache[name].slice() for (const func of tasks) { func(params) } } } off(name, func) { let tasks = this.cache[name] if (tasks) { const index = tasks.findIndex(fn => fn === func) if (index > 0) { tasks.splice(index, 1) } else { delete this.cache[name] } } }}const eventBus = new EventBus()export default eventBus
