这个javascript语法我到目前为止还没见过,它到底有什么作用?

今天我看到了一个我不熟悉的javascript语法(调用函数时)。就像:

def('Person') ({
  init: function(name) {this.name=name;}
  ,speak: function(text) {alert(text || 'Hi, my name is ' + this.name);}
});

和

def('Ninja') << Person ({
  kick: function() {this.speak('I kick u!');}
});

1:第一个例子中括号内的对象发生了什么?它由 def 不知何故起作用,但我不明白这里发生了什么(见 DEF 功能如下)。物体去哪儿了?

2:又是一样的东西,但是用 << 我从未见过的接线员(我想!)那是怎么回事?

代码来自 http://gist.github.com/474994 Joe Dalton做了一个小的javascript OO继承(很明显这是别人工作的一部分,但似乎完全重写了)。也许你想在那里查一下 DEF 函数,我在这里给你:

function def(klassName, context) {
  context || (context = global);

  // Create class on given context (defaults to global object)
  var Klass =
    context[klassName] = function Klass() {

      // Called as a constructor
      if (this != context) {

        // Allow the init method to return a different class/object
        return this.init && this.init.apply(this, arguments);
      }

      // Called as a method
      // defer setup of superclass and plugins
      deferred._super = Klass;
      deferred._plugins = arguments[0] || { };
    };

  // Add static helper method
  Klass.addPlugins = addPlugins;

  // Called as function when not
  // inheriting from a superclass
  deferred = function(plugins) {
    return Klass.addPlugins(plugins);
  };

  // valueOf is called to set up
  // inheritance from a superclass
  deferred.valueOf = function() {
    var Superclass = deferred._super;
    if (!Superclass)
        return Klass;
    Subclass.prototype = Superclass.prototype;
    Klass.prototype = new Subclass;
    Klass.superclass = Superclass;
    Klass.prototype.constructor = Klass;
    return Klass.addPlugins(deferred._plugins);
  };
  return deferred;
}