添加对象然后push_然后在对象上

ゞ浴缸里的玫瑰 2023-02-21 14:28 54阅读 0赞

添加对象然后push

[Promises][] were a revelation in JavaScript development, allowing us to enjoy async processing and avoid callback hell. Many new APIs like [Battery API][], [Cache API][], and others use the promise API. One fact you may not know is that you can add a `then` method to any object to make it Promise-like!

[承诺][Promises]是JavaScript开发的启示，它使我们可以享受异步处理并避免回调地狱。 许多新的API(例如[Battery API][] ， [Cache API][]和其他API)都使用promise API。 您可能不知道的一个事实是，您可以向任何对象添加`then`方法，使其类似于Promise！

Let's create a generic object with a `then` method that accepts a `resolve` function as its argument:

让我们用`then`方法创建一个通用对象，该方法接受一个`resolve`函数作为其参数：

j = { then: resolve => fetch("/").then(resolve) }

With an object featuring a `then` method, you can call the `then` method or use `await` syntax:

对于具有`then`方法的对象，可以调用`then`方法或使用`await`语法：

j.then(res => console.log(res));
    // Response {type: "basic", url: "https://davidwalsh.name/", redirected: false, status: 200, ok: true, …}
    
    // ... or an await...
    const response = await j;
    // Response {type: "basic", url: "https://davidwalsh.name/", redirected: false, status: 200, ok: true, …}

This technique is interesting and, under the right circumstances, can be employed to represent a logical usage.

该技术很有趣，并且在适当的情况下可以用来表示逻辑用法。

Hack or useful? How would you use this perk of `then`?

哈克还是有用？ 您将如何使用`then`特权？

> 翻译自: [https://davidwalsh.name/then-on-objects][https_davidwalsh.name_then-on-objects]

添加对象然后push

[Promises]: https://davidwalsh.name/tutorials/promises
[Battery API]: https://davidwalsh.name/javascript-battery-api
[Cache API]: https://davidwalsh.name/cache
[https_davidwalsh.name_then-on-objects]: https://davidwalsh.name/then-on-objects