Mootools 其实有个类似Jquery的live方法的东西

解决办法就是Mootools的 Element.Delegation

Element.Delegation的介绍：

Extends the Element type to include event-delegation in its event system.
Event delegation is a common practice where an event listener is attached to a parent element to monitor its children rather than attach events to every single child element. It's more efficient for dynamic content or highly interactive pages with a lot
of DOM elements.

用百度翻译一下：

将元素类型扩展为事件系统中包含事件委派。

事件代表团是一种常见的做法，其中一个事件侦听器被连接到父元素来监视它的孩子，而不是将事件附加到每个单独的子元素上。动态内容或高度互动的网页有很多DOM元素更有效。

然后你就参考手册吧