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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

Promise.allSettled() method returns a promise that resolves after all of the given promises have either fulfilled or rejected, with an array of objects that each describes the outcome of each promise.

It is typically used when you have multiple asynchronous tasks that are not dependent on one another to complete successfully, or you'd always like to know the result of each promise.

In comparison, the Promise returned by Promise.all() may be more appropriate if the tasks are dependent on each other / if you'd like to immediately reject upon any of them rejecting.

句法

Promise.allSettled(iterable);
					

参数

iterable

An iterable object, such as an Array , in which each member is a Promise .

返回值

A pending Promise that will be asynchronously fulfilled once every promise in the specified collection of promises has completed, either by successfully being fulfilled or by being rejected. At that time, the returned promise's handler is passed as input an array containing the outcome of each promise in the original set of promises.

不管怎样， if and only if an empty iterable is passed as an argument, Promise.allSettled() 返回 Promise object that has already been resolved as an empty array.

For each outcome object, a status string is present. If the status is fulfilled , then a value is present. If the status is rejected , then a reason is present. The value (or reason) reflects what value each promise was fulfilled (or rejected) with.

范例

Using Promise.allSettled

Promise.allSettled([
  Promise.resolve(33),
  new Promise(resolve => setTimeout(() => resolve(66), 0)),
  99,
  Promise.reject(new Error('an error'))
])
.then(values => console.log(values));
// [
//   {status: "fulfilled", value: 33},
//   {status: "fulfilled", value: 66},
//   {status: "fulfilled", value: 99},
//   {status: "rejected",  reason: Error: an error}
// ]
					

规范

规范
ECMAScript (ECMA-262) The definition of 'Promise.allSettled' in that specification.

浏览器兼容性

To contribute to this compatibility data, please write a pull request against this repository: https://github.com/mdn/browser-compat-data . 更新 GitHub 上的兼容性数据

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
allSettled()	Chrome 76	Edge 79	Firefox 71	IE No	Opera 63	Safari 13	WebView Android 76	Chrome Android 76	Firefox Android No	Opera Android 54	Safari iOS 13	Samsung Internet Android No	nodejs 12.9.0

图例

完整支持

完整支持

不支持

不支持

实现进度

The following table provides a daily implementation status for this feature, because this feature has not yet reached cross-browser stability. The data is generated by running the relevant feature tests in Test262 , the standard test suite of JavaScript, in the nightly build, or latest release of each browser's JavaScript engine.

另请参阅

• Promises
• Using promises
• Graceful asynchronous programming with promises
• Promise
• Promise.all()

元数据

• 最后修改： Jun 28, 2020

相关话题

1. 标准内置对象
2. Promise
3. 方法
   1. Promise.all()
   2. Promise.allSettled()
   3. Promise.any()
   4. Promise.prototype.catch()
   5. Promise.prototype.finally()
   6. Promise.prototype.then()
   7. Promise.race()
   8. Promise.reject()
   9. Promise.resolve()
4. 继承：
5. Function
6. 特性
   1. Function.arguments
   2. Function.caller
   3. Function.displayName
   4. Function.length
   5. Function.name
7. 方法
   1. Function.prototype.apply()
   2. Function.prototype.bind()
   3. Function.prototype.call()
   4. Function.prototype.toSource()
   5. Function.prototype.toString()
8. Object
9. 特性
   1. Object.prototype.__proto__
   2. Object.prototype.constructor
10. 方法
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toSource()
    10. Object.prototype.toString()
    11. Object.prototype.valueOf()
    12. Object.setPrototypeOf()