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function PubSub() { | |
this._event = {}; | |
this.on = function (eventName, handler) { | |
if (this._event[eventName]) { | |
this._event[eventName].push(handler); | |
} else { | |
this._event[eventName] = [handler]; | |
} | |
}; | |
this.emit = function (eventName) { | |
var events = this._event[eventName]; | |
var otherArgs = Array.prototype.slice.call(arguments).slice(1); | |
var self = this; | |
if (events) { | |
events.forEach(function (event) { | |
event.apply(self, otherArgs); | |
}); | |
} | |
}; | |
this.off = function (eventName, handler) { | |
var events = this._event[eventName]; | |
if (events) { | |
this._event[eventName] = events.filter(function (event) { | |
return event !== handler; | |
}); | |
} | |
}; | |
this.once = function (eventName, handler) { | |
var self = this; | |
function func() { | |
var args = Array.prototype.slice.call(arguments); | |
handler.apply(self, args); | |
this.off(eventName, func); | |
} | |
this.on(eventName, func); | |
}; | |
this.removeAll = function removeAll(eventName) { | |
delete this._event[eventName]; | |
}; | |
} | |
// ES6 | |
class PubSub { | |
constructor() { | |
this._event = {}; | |
} | |
on(eventName, handler) { | |
if (this._event[eventName]) { | |
this._event[eventName].push(handler); | |
} else { | |
this._event[eventName] = [handler]; | |
} | |
} | |
emit(eventName) { | |
const events = this._event[eventName]; | |
const otherArgs = [...arguments].slice(1); | |
const self = this; | |
if (events) { | |
events.forEach(event => { | |
event.apply(self, otherArgs); | |
}); | |
} | |
} | |
off(eventName, handler) { | |
const events = this._event[eventName]; | |
if (events) { | |
this._event[eventName] = events.filter(event => { | |
return event !== handler; | |
}); | |
} | |
} | |
once(eventName, handler) { | |
const self = this; | |
function func() { | |
const args = [...arguments]; | |
handler.apply(self, args); | |
this.off(eventName, func); | |
} | |
this.on(eventName, func); | |
} | |
removeAll(eventName){ | |
delete this._event[eventName]; | |
} | |
} |
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