AJAX同步和异步的区别 [英] AJAX sync and async difference

问题描述

什么是同步和异步AJAX calls.When使用同步时之间的区别异步？

What's the difference between sync and async AJAX calls.When to use sync and when async?

推荐答案

在一个非常基本的水平，您使用的异步模式，当你想呼叫的时候，你希望你的code发生在后台同步模式等到调用完成。

At a very basic level, you use an asynchronous mode when you want the call to occur in the background and a synchronous mode when you want your code to wait until the call has completed.

异步模式适合于Ajax的通常的方法调用，如你一般附加一个回调函数的的onreadystatechange 事件，使得你可以在服务器端的数据是应对准备好了，而不是等待数据的到来。

The asynchronous mode is the usual approach for AJAX calls, as you generally attach a callback function to the onreadystatechange event so that you can respond when the server-side data is ready, rather than waiting for the data to arrive.

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