Node.js EventTarget 与 DOM EventTarget

¥Node.js EventTarget vs. DOM EventTarget

Node.js EventTarget 和 EventTarget 网络应用接口 之间有两个主要区别：

¥There are two key differences between the Node.js EventTarget and the EventTarget Web API:

1. 尽管 DOM EventTarget 实例可能是分层的，但 Node.js 中没有分层和事件传播的概念。也就是说，调度到 EventTarget 的事件不会通过嵌套目标对象的层次结构传播，这些目标对象可能每个都有自己的事件句柄集。

   ¥Whereas DOM EventTarget instances may be hierarchical, there is no concept of hierarchy and event propagation in Node.js. That is, an event dispatched to an EventTarget does not propagate through a hierarchy of nested target objects that may each have their own set of handlers for the event.

2. 在 Node.js EventTarget 中，如果事件监听器是一个异步函数或返回一个 Promise，而返回的 Promise 拒绝，则拒绝被自动捕获并以与同步抛出的监听器相同的方式处理（详见 EventTarget 错误处理）。

   ¥In the Node.js EventTarget, if an event listener is an async function or returns a Promise, and the returned Promise rejects, the rejection is automatically captured and handled the same way as a listener that throws synchronously (see EventTarget error handling for details).