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).