Events. emitter. removeAllListeners method in node. js

This article mainly introduces node. events. emitter. the removeAllListeners method is described in this document. emitter. removeAllListeners method description, syntax, receive parameters, use instances and implementation source code. For more information, see Method description:

Removes all listeners. If an event is specified, all listeners of the specified event are removed.

Syntax:

The Code is as follows:

Emitter. removeAllListeners ([event])

Receiving parameters:

Event type. Multiple event types are supported.

Example:

The Code is as follows:

// Remove all listeners

Emitter. removeAllListeners ()

// Remove all listeners of the specified event

Emitter. removeAllListeners ('data ')

Source 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;
};