PromiseRejectionEvent.reason

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PromiseRejectionEvent reason read-only property is any JavaScript value or 对象 which provides the reason passed into Promise.reject() . This in theory provides information about why the promise was rejected.

句法

reason = PromiseRejectionEvent.reason

值

A value or object which provides information you can use to understand why the promise was rejected. This could be anything from an error code to an object with text, links, and whatever else you might wish to include.

范例

window.onunhandledrejection = function(e) {
  console.log(e.reason);
}

规范

规范	状态	注释
HTML 实时标准 The definition of 'PromiseRejectionEvent.reason' in that specification.	实时标准	初始定义。

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. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`reason`	Chrome 49	Edge ≤79	Firefox 69 69 Disabled ). To change preferences in Firefox, visit	IE No	Opera 36	Safari 11	WebView Android 49	Chrome Android 49	Firefox Android 68	Opera Android 36	Safari iOS 11.3	Samsung Internet Android 5.0

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元数据

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