PromiseRejectionEvent

在此页

构造函数
特性
方法
事件
范例
规范
浏览器兼容性
另请参阅
相关话题

PromiseRejectionEvent interface represents events which are sent to the global script context when JavaScript Promise s are rejected. These events are particularly useful for telemetry and debugging purposes.

For details on promise rejection events, see 承诺拒绝事件 in Using Promises .

  <div id="interfaceDiagram" style="display: inline-block; position: relative; width: 100%; padding-bottom: 20%; vertical-align: middle; overflow: hidden;"><svg style="display: inline-block; position: absolute; top: 0; left: 0;" viewbox="-50 0 600 120" preserveAspectRatio="xMinYMin meet"><a xlink:href="../API/Event" target="_top"><rect x="1" y="1" width="75" height="50" fill="#fff" stroke="#D4DDE4" stroke-width="2px" /><text  x="38.5" y="30" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">Event</text></a><polyline points="76,25  86,20  86,30  76,25" stroke="#D4DDE4" fill="none"/><line x1="86" y1="25" x2="116" y2="25" stroke="#D4DDE4"/><a xlink:href="../API/PromiseRejectionEvent" target="_top"><rect x="116" y="1" width="210" height="50" fill="#F4F7F8" stroke="#D4DDE4" stroke-width="2px" /><text  x="221" y="30" font-size="12px" font-family="Consolas,Monaco,Andale Mono,monospace" fill="#4D4E53" text-anchor="middle" alignment-baseline="middle">PromiseRejectionEvent</text></a></svg></div>

  a:hover text { fill: #0095DD; pointer-events: all;}

构造函数

PromiseRejectionEvent(): 创建 PromiseRejectionEvent event, given the type of event ( unhandledrejection or rejectionhandled ) and other details.

特性

还继承特性从其父级 事件 .

PromiseRejectionEvent.promise 只读: JavaScript Promise that was rejected.
PromiseRejectionEvent.reason 只读: A value or 对象 indicating why the promise was rejected, as passed to Promise.reject() .

方法

This interface has no unique methods; inherits methods from its parent 事件 .

事件

rejectionhandled: Fired when a JavaScript Promise is rejected, and after the rejection is handled by the promise's rejection handling code.
unhandledrejection: Fired when a JavaScript Promise is rejected but there is no rejection handler to deal with the rejection.

范例

This simple example catches unhandled promise rejections and logs them for debugging purposes.

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' 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
`PromiseRejectionEvent`	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
`PromiseRejectionEvent()` 构造函数	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
`promise`	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
`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

在此页

构造函数

特性

方法

事件

范例

规范

浏览器兼容性

图例

另请参阅

元数据

相关话题