Javascript 原生 ES6 承诺中 Bluebird Promise.finally 的等价物是什么？
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What is the equivalent of Bluebird Promise.finally in native ES6 promises?
提问by Aric Lasry
Bluebird offers a finallymethod that is being called whatever happens in your promise chain. I find it very handy for cleaning purposes (like unlocking a resource, hiding a loader, ...)
Bluebird 提供了一种finally方法，无论您的承诺链中发生什么，它都会被调用。我发现它用于清理目的非常方便（例如解锁资源，隐藏加载程序，......）
Is there an equivalent in ES6 native promises?
ES6 原生 Promise 中是否有等价物？
回答by Miguel Mota
As of February 7, 2018
截至 2018 年 2 月 7 日
Chrome 63+, Firefox 58+, and Opera 50+ support Promise.finally.
支持 Chrome 63+、Firefox 58+ 和 Opera 50+ Promise.finally。
In Node.js 8.1.4+ (V8 5.8+), the feature is available behind the flag --harmony-promise-finally.
在 Node.js 8.1.4+ (V8 5.8+) 中，该功能在 flag 后面可用--harmony-promise-finally。
The Promise.prototype.finally ECMAScript Proposalis currently in stage 3of the TC39 process.
所述Promise.prototype.finally ECMAScript的提案是目前在阶段3的TC39过程。
In the meantime to have promise.finally functionality in all browsers; you can add an additional then()after the catch()to always invoke that callback.
同时在所有浏览器中都有 promise.finally 功能；您可以then()在catch()始终调用该回调之后添加一个额外的。
Example:
例子：
myES6Promise.then(() => console.log('Resolved'))
.catch(() => console.log('Failed'))
.then(() => console.log('Always run this'));
JSFiddle Demo: https://jsfiddle.net/9frfjcsg/
JSFiddle 演示：https://jsfiddle.net/9frfjcsg/
Or you can extend the prototype to include a finally()method (not recommended):
或者您可以扩展原型以包含一个finally()方法（不推荐）：
Promise.prototype.finally = function(cb) {
const res = () => this;
const fin = () => Promise.resolve(cb()).then(res);
return this.then(fin, fin);
};
JSFiddle Demo: https://jsfiddle.net/c67a6ss0/1/
JSFiddle 演示：https://jsfiddle.net/c67a6ss0/1/
There's also the Promise.prototype.finallyshim library.
