javascript eventemitter多次事件一次

var EventEmitter = require('events').EventEmitter;

EventEmitter.prototype.once = function(events,handler){
    // no events,get out!
    if(! events)
        return; 

    // Ugly,but Helps getTing the rest of the function 
    // short and simple to the eye ... I guess...
    if(!(events instanceof Array))
        events = [events];

    var _this = this;

    var cb = function(){
        events.forEach(function(E){     
            // This only removes the listener itself 
            // from all the events that are listening to it
            // i.e.,does not remove other listeners to the same event!
            _this.removeListener(e,cb); 
        });

        // This will allow any args you put in xxx.emit('event',...) to be sent 
        // to your handler
        handler.apply(_this,Array.prototype.slice.call(arguments,0));
    };

    events.forEach(function(E){ 
        _this.addListener(e,cb);
    }); 
};

我在这里创造了一个要点：https://gist.github.com/3627823
其中包括一个示例(您的示例,有一些日志)

[updatE]
以下是对我的执行情况的一次调整,只会根据评论中的要求删除被调用的事件：

var EventEmitter = require('events').EventEmitter;

EventEmitter.prototype.once = function(events,but Helps getTing the rest of the function 
    // short and simple to the eye ... I guess...
    if(!(events instanceof Array))
        events = [events];

    var _this = this;

    // A Helper function that will generate a handler that 
    // removes itself when its called
    var gen_cb = function(event_name){
        var cb = function(){
            _this.removeListener(event_name,cb);
            // This will allow any args you put in 
            // xxx.emit('event',...) to be sent 
            // to your handler
            handler.apply(_this,0));
        };
        return cb;
    };


    events.forEach(function(E){ 
        _this.addListener(e,gen_cb(E));
    }); 
};

我发现node.js在EventEmitter中已经有一个方法：check here the source code,但这可能是最近的一个补充.