一、What is HTTP? 这个问题如果大家看过前面几篇文章,肯定能很轻易的回答:HTTP是应用层协议,用来传输超文本,或者可以说是用来传输超媒体的一种协议,HTTP是无状态的基于请求-响应模型的。你说的没错,接下来我也可能会聊到你想到的这些。但是还有呢?还有呢?下面,我们就来捋一捋HTTP的特点,来说一下这“还有”的部分是什么。 1)
How AJAX Works 1. An event occurs in a web page (the page is loaded, a button is clicked) 2. An XMLHttpRequest object is created by JavaScript 3. The XMLHttpRequest object sends a request to a web server 4. The server processes the request ...
Before an XMLHTTP request is sent, the URL of the hosting page is compared to the URL in theopenmethod to determine if the URLs are in the same domain. If not, the request is handled according to the policy of thesecurity zonein which the request originates. The native XMLHTTP object ...
Accessibility- Because not all browsers have JavaScript or XMLHttpRequest object support, you must ensure that you provide a way to make the web application accessible to all users. Bookmark and navigation- Since Ajax is used to asynchronously load bits of content into an existing page, some of...
XHR is a JavaScript object that is used to transfer data between a web browser and a web server. XHR is often used to request and receive data for the purpose of modifying a web page. Despite the XML and Http in the name, XHR is used with other protocols than HTTP, and the data ca...
AJAX is a set of techniques used to build websites and web applications—but what does that mean? Read this to learn exactly what AJAX is, how it works, and what it’s used for.
POST:就是向Request-URI上传数据,或者提交数据。 PUT:类似于POST。 DELETE:删除目标资源。 TRACE:追踪请求-响应的路径。 CONNECT:建立一个特殊的连接隧道。 OPTIONS:列出允许对该资源使用的方法。 我们简单的罗列了一下HTTP所规定的请求方法。其中前四个比较常用,GET和POST这两个是最常用的。后面的四个用的就很少...
XMLHttpRequest for asynchronous transmission. To conduct all these technologies in combination, JavaScript is used.AJAX DrawbacksThose browsers which support it are only the one on which Ajax will be executed. Ajax does not hold up on some screen reading technologies. The effectively created content...
But what exactly are these foundations and how does Ajax function in the browser? Down To Basics: What Is Ajax? Strictly speaking, Ajax is a type of API object with the earliest method being XMLHttpRequest(). This provides client-side functionality to pass(or retrieve) data from the client...
AJAX Advantages 1 )Speed Reduce the server traffic in both side request. Also reducing the time consuming on both side response. 2) XMLHttpRequest XMLHttpRequest has an important role in the Ajax web development technique. XMLHttpRequest is special JavaScript object that was designed by Microsoft...