Use of releaseEvents() is deprecated. To upgrade your code, use the DOM 2 removeEventListener() method. For more help http://developer.mozilla.org/en/docs/DOM:element.removeEventListener
releaseEvents() 已不赞成使用。请改用 DOM 2 removeEventListener() 方法。可访问 http://developer.mozilla.org/en/docs/DOM:element.removeEventListener 详细了解