dan teng

gistfile1.js

var pull = (function(){
  var target = document.getElementById("feedTabs").getElementsByTagName('a')[0],
    event, timer;

  return {
    every: function(duration) {
      timer && this.stop();
      
      timer = setInterval(function(){
        event = document.createEvent("MouseEvents");
        event.initMouseEvent("click", true, true, document.defaultView, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
        target.dispatchEvent(event);
      }, ~~duration * 1000 || 2000);
    },
    
    cancel: function(){
      timer && clearInterval(timer);
    }
  }
})();