callbacks

简明释义

英[ˈkɔːl.bæks]美[ˈkɔlˌbæks]

n. 回调函数；回叫信号（callback 的复数）

英英释义

单词用法

同义词

反义词

例句

1.Callbacks are not supported.

不支持回调。

2.In this article, I created callbacks as real classes.

在本文中，我用真正的类实现回调。

3.These callbacks are referred to as event handlers.

这些回调称为事件句柄。

4.Not using dojo.hitch for callbacks where needed.

在需要的时候没有为回调使用 dojo.hitch。

5.Implementing bean lifecycle callbacks and scope.

实现bean生命周期回调和范围。

6.This callback handler implements the handle (callback callbacks ) method in the interface.

回调处理器在接口中实现一个处理方法(callbackcallbacks )。

7.In Listing 2, both callbacks use the same class.

在清单2中，所有的回调必须使用相同的类。

8.Listing 7. Widget callbacks with display.c.

清单7.display . c与控件回调。

9.The library provides built-in callbacks for error handling.

该库提供内置的回调函数用于错误处理。

10.In JavaScript, callbacks are often used for event handling.

在JavaScript中，回调函数通常用于事件处理。

11.The developer implemented several callbacks to handle asynchronous operations.

开发者实现了多个回调函数来处理异步操作。

12.The function accepts callbacks as arguments to customize its behavior.

该函数接受回调函数作为参数，以自定义其行为。

13.You can pass multiple callbacks to the API for different outcomes.

你可以将多个回调函数传递给API以实现不同的结果。

作文

In the world of programming, the term callbacks refers to a function that is passed as an argument to another function. This concept is crucial in asynchronous programming, where operations may take some time to complete. For instance, when a developer writes code to fetch data from a server, they often use callbacks to handle the response once the data is retrieved. The use of callbacks allows the program to continue executing other tasks while waiting for the data to arrive, thus improving efficiency and user experience.Imagine a scenario where you are ordering food online. When you place your order, the website does not wait idly for the restaurant to confirm your order. Instead, it uses callbacks to handle the confirmation process. Once the restaurant confirms your order, the website can then update your order status without freezing or delaying other functions on the site. This is a practical example of how callbacks work in real life.Furthermore, callbacks can be categorized into two types: synchronous and asynchronous. Synchronous callbacks are executed immediately within the function that calls them, while asynchronous callbacks are executed after the completion of an operation, often involving events or timers. Understanding the difference between these two types of callbacks is vital for any programmer who wishes to write efficient and responsive applications.One common issue that arises with callbacks is known as 'callback hell.' This occurs when multiple nested callbacks lead to code that is difficult to read and maintain. To mitigate this problem, developers often use promises or async/await syntax, which can help flatten the structure of the code and make it more readable. Despite these challenges, mastering callbacks is essential for anyone looking to excel in JavaScript or other programming languages that employ this technique.In addition to programming, the concept of callbacks can also be found in everyday situations. For instance, when you apply for a job, you might be told that the company will get back to you with a response. This promise to contact you later is akin to a callback. The company is essentially saying, 'Once we have reviewed your application, we will reach out to you.' Just like in programming, the expectation is set that further action will occur based on a previous event.In conclusion, the term callbacks plays a significant role in both programming and daily life. It represents the idea of responding to an event or action that has taken place. Whether in coding or in communication, understanding the function and importance of callbacks can enhance our ability to navigate complex systems efficiently. As we continue to engage with technology and its applications, the relevance of callbacks will only grow, making it an essential concept to grasp for anyone interested in the field of programming or beyond.

在编程的世界中，术语callbacks指的是作为参数传递给另一个函数的函数。这个概念在异步编程中至关重要，因为操作可能需要一些时间才能完成。例如，当开发人员编写代码以从服务器获取数据时，他们通常使用callbacks来处理一旦数据被检索到后的响应。使用callbacks可以让程序在等待数据到达的同时继续执行其他任务，从而提高效率和用户体验。想象一下你在线订餐的场景。当你下订单时，网站并不会闲着等待餐厅确认你的订单。相反，它使用callbacks来处理确认过程。一旦餐厅确认了你的订单，网站就可以更新你的订单状态，而不会冻结或延迟网站上的其他功能。这是callbacks在现实生活中工作的一种实用示例。此外，callbacks可以分为两种类型：同步和异步。同步callbacks在调用它们的函数内部立即执行，而异步callbacks在操作完成后执行，通常涉及事件或定时器。理解这两种类型的callbacks之间的区别对于任何希望编写高效和响应式应用程序的程序员来说都是至关重要的。与callbacks相关的一个常见问题是“回调地狱”。当多个嵌套的callbacks导致代码难以阅读和维护时，就会出现这种情况。为了缓解这个问题，开发人员通常使用承诺（promises）或async/await语法，这可以帮助扁平化代码结构，使其更易读。尽管存在这些挑战，掌握callbacks对于任何希望在JavaScript或其他采用这一技术的编程语言中脱颖而出的人来说都是必不可少的。除了编程之外，callbacks的概念也可以在日常情况下找到。例如，当你申请工作时，你可能会被告知公司会给你回复。这种稍后联系你的承诺类似于callback。公司本质上是在说：“一旦我们审核了你的申请，我们将与你联系。”就像在编程中一样，期望是基于之前发生的事件进行进一步的行动。总之，术语callbacks在编程和日常生活中都发挥着重要作用。它代表了对已发生事件或行为的响应的想法。无论是在编码还是沟通中，理解callbacks的功能和重要性都可以增强我们高效地导航复杂系统的能力。随着我们继续与技术及其应用互动，callbacks的相关性只会增加，因此，对于任何对编程领域或更广泛领域感兴趣的人来说，掌握这一概念都是至关重要的。