sivagao

  var pubsub = function(l, u, r, i) { // cool! 闭包并且初始化vars
    return function(n, f) {
      r = l[n] = l[n] || [], i = -1;
      if (f && f.call) r.push(f);
      else while (r[++i]) r[i].apply(u, arguments);
    }
  }({});

  // subscribe to event
  pubsub("eat_cookie", function() {