[zh-CN]: update the translation of the promise #27965
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(comment last updated: 2025-07-07 01:27:41) |
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| `.then()` 方法最多接受两个参数；第一个参数是 Promise 兑现时的回调函数，第二个参数是 Promise 拒绝时的回调函数。每个 `.then()` 返回一个新生成的 Promise 对象，这个对象可被用于链式调用，例如： | ||
| {{jsxref("Promise.prototype.then()")}}、{{jsxref("Promise.prototype.catch()")}} 和 {{jsxref("Promise.prototype.finally()")}} 方法用于将进一步的操作与已敲定的 Promise 相关联。`.then()` 方法最多接受两个参数；第一个参数是 Promise 兑现时的回调函数，第二个参数是 Promise 拒绝时的回调函数。`.catch()` 和 `.finally()` 方法在内部调用 `.then()`，使错误处理更加简洁。例如，`.catch()` 实际上就是一个没有传递兑现处理器的 `.then()`。由于这些方法返回 Promise，因此它们可以被链式调用。例如： |
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| {{jsxref("Promise.prototype.then()")}}、{{jsxref("Promise.prototype.catch()")}} 和 {{jsxref("Promise.prototype.finally()")}} 方法用于将进一步的操作与已敲定的 Promise 相关联。`.then()` 方法最多接受两个参数；第一个参数是 Promise 兑现时的回调函数，第二个参数是 Promise 拒绝时的回调函数。`.catch()` 和 `.finally()` 方法在内部调用 `.then()`，使错误处理更加简洁。例如，`.catch()` 实际上就是一个没有传递兑现处理器的 `.then()`。由于这些方法返回 Promise，因此它们可以被链式调用。例如： | |
| {{jsxref("Promise/then", "then()")}}、{{jsxref("Promise/catch", "catch()")}} 和 {{jsxref("Promise/finally", "finally()")}} 方法用于将进一步的操作与已敲定的 Promise 相关联。`.then()` 方法最多接受两个参数；第一个参数是 Promise 兑现时的回调函数，第二个参数是 Promise 拒绝时的回调函数。`.catch()` 和 `.finally()` 方法在内部调用 `.then()`，使错误处理更加简洁。例如，`.catch()` 实际上就是一个没有传递兑现处理器的 `.then()`。由于这些方法返回 Promise，因此它们可以被链式调用。例如： |
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| 另一个使用 `Promise` 和 {{domxref("XMLHttpRequest")}} 加载图像的示例如下所示。 | ||
| 每一步都有注释，可以让你详细了解 Promise 和 XHR 架构。 |
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| 另一个使用 `Promise` 和 {{domxref("XMLHttpRequest")}} 加载图像的示例如下所示。 | |
| 每一步都有注释，可以让你详细了解 Promise 和 XHR 架构。 | |
| 另一个使用 `Promise` 和 {{domxref("XMLHttpRequest")}} 加载图像的示例如下所示。每一步都有注释，可以让你详细了解 Promise 和 XHR 架构。 |
| 每一步都有注释，可以让你详细了解 Promise 和 XHR 架构。 | ||
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| ```html hidden live-sample___promises | ||
| <h1>Promise example</h1> |
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| <h1>Promise example</h1> | |
| <h1>Promise 示例</h1> |
| @@ -449,4 +511,4 @@ btn.addEventListener("click", testPromise); | |||
| - [使用 promise](/zh-CN/docs/Web/JavaScript/Guide/Using_promises) | |||
| - [Promises/A+ 规范](https://promisesaplus.com/) | |||
| - [JavaScript Promise：简介](https://web.developers.google.cn/articles/promises) | |||
| - [Domenic Denicola：回调、Promise 和协程——JavaScript 中的异步编程模式](https://www.slideshare.net/domenicdenicola/callbacks-promises-and-coroutines-oh-my-the-evolution-of-asynchronicity-in-javascript) | |||
| - [回调、Promise 和协程——JavaScript 中的异步编程模式](https://www.slideshare.net/domenicdenicola/callbacks-promises-and-coroutines-oh-my-the-evolution-of-asynchronicity-in-javascript) | |||
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| - [回调、Promise 和协程——JavaScript 中的异步编程模式](https://www.slideshare.net/domenicdenicola/callbacks-promises-and-coroutines-oh-my-the-evolution-of-asynchronicity-in-javascript) | |
| - Domenic Denicola 的幻灯片演示（2011）：[回调、Promise 和协程——JavaScript 中的异步编程模式](https://www.slideshare.net/domenicdenicola/callbacks-promises-and-coroutines-oh-my-the-evolution-of-asynchronicity-in-javascript) |
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