SOURCE

var Event = (function(){
    var clientList = {},
     listen,
     trigger,
     remove;

    listen = function(key,fn){
        if(!clientList[key]){
            clientList[key] = [];
        }
        clientList[key].push(fn)
    };

    trigger = function(){
        var key = Array.prototype.shift.call(arguments),
        fns = clientList[key];
        if(!fns || fns.length === 0){
            return false
        }
        for(var i = 0,fn;fn = fns[i++];){
            fn.apply(this,arguments);
        }
    };
    remove = function(key,fn){
        var fns = clientList[key];
        if(!fns){
            return false;
        }

        if(!fn){
            fns && (fns.length = 0);
        }else{
            for(var l = fns.length - 1;l >= 0; l--){
                var _fn = fns[l]
                if(_fns === fn){
                    fns.splice(l,1)
                }
            }
        }
    }
    return {
        listen:listen,
        trigger:trigger,
        remove:remove
    }

})();

Event.listen('squareMeter88',function(price){
    console.log(price)
});
// Event.trigger('squareMeter88',2000000)
Event.trigger('squareMeter122',3000000)