Simple stupid Event Emitter class implementation in Javascript

SimpleEventEmiiter.js

function EventEmitter(){
    this.listers = {};
}

EventEmitter.prototype = {

    on: function( name, handler ){
        var evnt = this.listers[ name ];
        if( !evnt ){
            this.listers[ name ] = [ handler ];
        } else {
            evnt.push( handler );
        }
    },


    emit: function( name, data1, data2 ){
        var evnt = this.listers[ name ];
        if( evnt ){
            evnt.forEach( function( handler ){
                handler( name, data1, data2 );
            });
        }
    }

};