On previous versions, you could call it like for other data :
obj.data('events');
In jQuery 1.8, this direct access was removed, so in recent versions you must call it like this :
$._data(obj[0],"events")
// obj.data('events')已經棄用，要使用$._data(obj[0],"events")

例：

//取出元素div綁定的事件
var events= $._data($("div")[0], "events");
if (events && events["click"]) {
  console.info('已經綁定click事件') ;
} ;