事件委派是一种通过单一共同父元素响应 UI 事件的方法，而非每个子元素。它利用了事件冒泡机制，减少了需要管理的函数数量，节省内存，并减少了代码与 DOM 之间的耦合度。使用事件委派不需要担心因修改 DOM 而移除事件处理程序。
What event delegation ?
DOM event delegation is a mechanism of responding to ui-events via a single common parent rather than each child, through the magic of event "bubbling".
Advantages
Event delegation has main advantages:
- Fewer functions to manage.
- Takes up less memory.
- Fewer ties between your code and the DOM.
- Don’t need to worry about removing event handlers when changing the DOM via
innerHTML.
扩展阅读
- Event delegation in JavaScript
- Understanding Event Delegation
- Working with Events, Part 3: More Event Delegation with jQuery
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