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// event.jsclassEvent{ /** * style="color: #333333; font-weight: bold;">if (typeof fn != "function") { console.error('fn must be a function') return } this._cbs = this._cbs || {} ;(this._cbs[event] = this._cbs[event] || []).push(fn) } /** * emit 方法接受一个事件名称参数，在 Event 对象的 _cbs 属性中取出对应的数组，并逐个执行里面的回调函数 */ emit (event) { this._cbs = this._cbs || {} var callbacks = this._cbs[event], args if (callbacks) { callbacks = callbacks.slice(0) args = [].slice.call(arguments, 1) for (var i = 0, len = callbacks.length; i < len; i++) { callbacks[i].apply(null, args) } } } /** * off 方法接受事件名称和当初注册的回调函数作参数，在 Event 对象的 _cbs 属性中删除对应的回调函数。 */ off (event, fn) { this._cbs = this._cbs || {} // all if (!arguments.length) { this._cbs = {} return } var callbacks = this._cbs[event] if (!callbacks) return // remove all handlers if (arguments.length === 1) { delete this._cbs[event] return } // remove specific handler var cb for (var i = 0, len = callbacks.length; i < len; i++) { cb = callbacks[i] if (cb === fn || cb.fn === fn) { callbacks.splice(i, 1) break } } return

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