Instructions for using the events.emitter.removeAllListeners method in node.js_node.js

Method description:

Remove all listeners. If event is specified, all listeners for the specified event will be removed.

Grammar:

Copy code The code is as follows:

emitter.removeAllListeners([event])

Receive parameters:

event event type, supports multiple

Example:

Copy code The code is as follows:

//Remove all listeners

emitter.removeAllListeners()

//Remove all listeners for the specified event

emitter.removeAllListeners('data')

Source code:

Copy code The code is as follows:

EventEmitter.prototype.removeAllListeners = function(type) {
var key, listeners;
if (!this._events)
Return this;
// not listening for removeListener, no need to emit
if (!this._events.removeListener) {
If (arguments.length === 0)
This._events = {};
​ else if (this._events[type])
Delete this._events[type];
Return this;
}
// emit removeListener for all listeners on all events
if (arguments.length === 0) {
for (key in this._events) {
If (key === 'removeListener') continue;
This.removeAllListeners(key);
}
This.removeAllListeners('removeListener');
This._events = {};
Return this;
}
listeners = this._events[type];
if (util.isFunction(listeners)) {
This.removeListener(type, listeners);
} else {
// LIFO order
while (listeners.length)
This.removeListener(type, listeners[listeners.length - 1]);
}
Delete this._events[type];
return this;
};