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入門篇
Ajax 簡介。

非同步 JavaScript 及 XML(Asynchronous JavaScript and XML,AJAX) 並不能稱做是種「技術」,而是 2005 年時由 Jesse James Garrett 所發明的術語,描述一種使用數個既有技術的「新」方法。這些技術包括 HTMLXHTML層疊樣式表JavaScript文件物件模型XMLXSLT 以及最重要的 XMLHttpRequest 物件
當這些技術被結合在 Ajax 模型中,Web 應用程式便能快速、即時更動介面及內容,不需要重新讀取整個網頁,讓程式更快回應使用者的操作。

雖然 X 在 Ajax 中代表 XML,但由於 JSON 的許多優點,如輕量以及其本身就是 JavaScript 的一部分等,讓現今 JSON 比起 XML 被更廣泛的使用。JSON 與 XML 兩者都被用來在 Ajax 模型中包裝資訊。

文件

入門篇
這篇文章會指引你瞭解 Ajax 的基礎知識並提供了兩個簡單的動手做範例來入門。
使用 XMLHttpRequest API
XMLHttpRequest API 是 Ajax 的核心。這篇文章將解釋如何使用一些 Ajax 技術,例如:
Fetch API
Fetch API 提供了取得資源(fetching resources)的介面(interface)。It will seem familiar to anyone who has used XMLHTTPRequest, but this API provides a more powerful and flexible feature set.
Server-sent events
Traditionally, a web page has to send a request to the server to receive new data; that is, the page requests data from the server. With server-sent events, it's possible for a server to send new data to a web page at any time, by pushing messages to the web page. These incoming messages can be treated as Events + data inside the web page. See also: Using server-sent events.
Pure-Ajax navigation example
This article provides a working (minimalist) example of a pure-Ajax website composed only of three pages.
Sending and Receiving Binary Data
The responseType property of the XMLHttpRequest object can be set to change the expected response type from the server. Possible values are the empty string (default), "arraybuffer", "blob", "document", "json", and "text". The response property will contain the entity body according to responseType, as an ArrayBuffer, Blob, Document, JSON, or string. This article will show some Ajax I/O techniques.
XML
The Extensible Markup Language (XML) is a W3C-recommended general-purpose markup language for creating special-purpose markup languages. It is a simplified subset of SGML, capable of describing many different kinds of data. Its primary purpose is to facilitate the sharing of data across different systems, particularly systems connected via the Internet.
JXON
JXON stands for lossless Javascript XML Object Notation, it is a generic name by which is defined the representation of Javascript object trees (JSON) using XML.
Parsing and serializing XML
How to parse an XML document from a string, a file or via javascript and how to serialize XML documents to strings, Javascript Object trees (JXON) or files.
XPath
XPath stands for XML Path Language, it uses a non-XML syntax that provides a flexible way of addressing (pointing to) different parts of an XML document. As well as this, it can also be used to test addressed nodes within a document to determine whether they match a pattern or not.
The FileReader API
The FileReader API lets web applications asynchronously read the contents of files (or raw data buffers) stored on the user's computer, using File or Blob objects to specify the file or data to read. File objects may be obtained from a FileList object returned as a result of a user selecting files using the <input> element, from a drag and drop operation's DataTransfer object, or from the mozGetAsFile() API on an HTMLCanvasElement.
HTML in XMLHttpRequest
The W3C XMLHttpRequest specification adds HTML parsing support to XMLHttpRequest, which originally supported only XML parsing. This feature allows Web apps to obtain an HTML resource as a parsed DOM using XMLHttpRequest.
Other resources
Other Ajax resources you may find useful.

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參見

Alternate Ajax Techniques
Most articles on Ajax have focused on using XMLHttp as the means to achieving such communication, but Ajax techniques are not limited to just XMLHttp. There are several other methods.
Ajax: A New Approach to Web Applications
Jesse James Garrett, of adaptive path, wrote this article in February 2005, introducing Ajax and its related concepts.
A Simpler Ajax Path
"As it turns out, it's pretty easy to take advantage of the XMLHttpRequest object to make a web app act more like a desktop app while still using traditional tools like web forms for collecting user input."
Ajax Mistakes
Alex Bosworth has written this article outlining some of the mistakes Ajax application developers can make.
Tutorial with examples.
 
XMLHttpRequest specification
W3C Working draft

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