方法说明:
移除指定事件的某个监听器。
语法:
emitter.removeListener(event, listener)
接收参数:
event (string) 事件类型
listener (function) 已注册过的监听器
例子:
var callback = function(stream) { console.log('someone connected!'); }; server.on('connection', callback); // ... server.removeListener('connection', callback);
源码:
// emits a 'removeListener' event iff the listener was removed EventEmitter.prototype.removeListener = function(type, listener) { var list, position, length, i; if (!util.isFunction(listener)) throw TypeError('listener must be a function'); if (!this._events || !this._events[type]) return this; list = this._events[type]; length = list.length; position = -1; if (list === listener || (util.isFunction(list.listener) && list.listener === listener)) { delete this._events[type]; if (this._events.removeListener) this.emit('removeListener', type, listener); } else if (util.isObject(list)) { for (i = length; i-- > 0;) { if (list[i] === listener || (list[i].listener && list[i].listener === listener)) { position = i; break; } } if (position < 0) return this; if (list.length === 1) { list.length = 0; delete this._events[type]; } else { list.splice(position, 1); } if (this._events.removeListener) this.emit('removeListener', type, listener); } return this; };