PromiseRejectionEvent.promise

在此页

句法
范例
规范
浏览器兼容性
另请参阅
相关话题

PromiseRejectionEvent 接口的 promise read-only property indicates the JavaScript Promise which was rejected. You can examine the event's PromiseRejectionEvent.reason property to learn why the promise was rejected.

句法

promise = PromiseRejectionEvent.promise

值

JavaScript Promise which was rejected, and whose rejection went unhandled.

范例

This example listens for unhandled promises and, if the reason is an object with a code field containing the text "Module not ready", it sets up an idle callback that will retry the task that failed to execute correctly.

event.preventDefault() is called to indicate that the promise has now been handled.

window.onunhandledrejection = function(event) {
  if (event.reason.code && event.reason.code == "Module not ready") {
    window.requestIdleCallback(function(deadline) {
      loadModule(event.reason.moduleName)
        .then(performStartup);
    });
    event.preventDefault();
  }
}

规范

规范	状态	注释
HTML 实时标准 The definition of 'PromiseRejectionEvent.promise' 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
`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

在此页

句法

值

范例

规范

浏览器兼容性

图例

另请参阅

元数据

相关话题