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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | 3x 4x 3x 4x 4x 3x 3x 3x 1x 1x 2x 1x | export class EventEmitter {
constructor() {
this.events = {};
}
on(eventName, callback) {
if (!this.events[eventName]) {
this.events[eventName] = [];
}
this.events[eventName].push(callback);
return this;
}
emit(eventName,...args) {
Eif (this.events[eventName]) {
this.events[eventName].forEach(callback => callback(...args));
}
return this;
}
off(eventName, callback) {
Eif (this.events[eventName]) {
this.events[eventName] = this.events[eventName].filter(
cb => cb!== callback
);
}
return this;
}
} |