Window: sự kiện rejectionhandled
The rejectionhandled event is sent to the script's global scope (usually window but also Worker) whenever a rejected JavaScript Promise is handled late, i.e., when a handler is attached to the promise after its rejection had caused an unhandledrejection event.
This can be used in debugging and for general application resiliency, in tandem with the unhandledrejection event, which is sent when a promise is rejected but there is no handler for the rejection at the time.
Cú pháp
Sử dụng tên sự kiện trong các phương thức như addEventListener(), hoặc thiết lập thuộc tính trình xử lý sự kiện.
addEventListener("rejectionhandled", (event) => { })
onrejectionhandled = (event) => { }
Kiểu sự kiện
A PromiseRejectionEvent. Inherits from Event.
Event properties
PromiseRejectionEvent.promiseRead only-
The JavaScript
Promisethat was rejected. PromiseRejectionEvent.reasonRead only-
A value or
Objectindicating why the promise was rejected, as passed toPromise.reject().
Event handler aliases
In addition to the Window interface, the event handler property onrejectionhandled is also available on the following targets:
Ví dụ
You can use the rejectionhandled event to log promises that get rejected to the console, along with the reasons why they were rejected:
window.addEventListener("rejectionhandled", (event) => {
console.log(`Promise rejected; reason: ${event.reason}`);
});
Đặc tả kỹ thuật
| Specification |
|---|
| HTML # unhandled-promise-rejections |
| HTML # handler-window-onrejectionhandled |