About Ajax－关于Ajax

Ajax(Asynchronous JavaScript and XML), is a group of inter-related web development techniques used for creating interactive web applications. A primary characteristic is the increased responsiveness and interactivity of web pages achieved by exchanging small amounts of data with the server "behind the scenes" so that entire web pages do not have to be reloaded each time there is a need to fetch data from the server. This is intended to increase the web page's interactivity, speed, functionality and usability.

Ajax（英文Asynchronous JavaScript and XML的缩写），是一组相关的网站开发技术，用来创建交互式网站应用程序。它的一个主要特征是：当需要从服务器读取数据的时候，通过在后台与服务器交换少量的数据就能使得网页的响应性和交互性得到提高，所以整个网页就没必要每次都重新载入。这就增加了网页的交互性，速度，功能性和使用性。

Like DHTML and LAMP, Ajax is not a technology in itself, but a term that refers to the use of a group of technologies.

像DHTML和LAMP一样，Ajax本身并不是一项技术，而是涉及一组技术使用的一个术语。

The "core" and defining element of Ajax is the XMLHttpRequest object, which gives browsers the ability to make dynamic and asynchronous data requests without having to reload a page, eliminating the need for page refreshes.

Ajax的核心和定义元素是XMLHttpRequest对象，它使得浏览器不必重新加载页面就能够进行动态的和异步的数据请求，从而消除了页面刷新的需求。

Besides XMLHttpRequest, the use of DOM, CSS and JavaScript provides a richer "single-page" experience.

除了XMLHtttRequest，DOM，CSS和JavaScript的（结合）使用（给用户）提供了一种更富有“单一页面”的体验。