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当Promise被rejected且有rejection处理器时会在全局触发rejectionhandled 事件(通常是发生在window下，但是也可能发生在Worker中)。应用于调试一般应用回退。当Promise被rejected且没有rejection处理器处理时会触发unhandledrejection事件。这两个事件协同工作。
| 是否冒泡 | No |
|---|---|
| 是否可取消 | No |
| 接口 | PromiseRejectionEvent |
| 事件处理器属性 | onrejectionhandled |
例子
你可以使用rejectionhandled事件在控制台打印出被rejected的Promise，以及被rejected的原因：
window.addEventListener("rejectionhandled", event => {
console.log("Promise rejected; reason: " + event.reason);
}, false);
说明
| Specification | Status | Comment |
|---|---|---|
| HTML Living Standard rejectionhandled |
Living Standard | Initial definition. |
浏览器兼容性
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
rejectionhandled event | Chrome Full support 49 | Edge ? | Firefox
Full support
69
| IE No support No | Opera No support No | Safari No support No | WebView Android No support No | Chrome Android No support No | Firefox Android
Full support
68
| Opera Android No support No | Safari iOS No support No | Samsung Internet Android No support No |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- User must explicitly enable this feature.
- User must explicitly enable this feature.