First, the main reason to use Ajax
1, through the appropriate AJAX application to achieve a better user experience;
2, some of the previous server burden to the client, to facilitate the client idle processing capacity to deal with, reduce the burden of server and bandwidth, so as to save the ISP space and bandwidth rental costs.
Second, the reference
Ajax This concept of the earliest proposed by Jesse James Garrett that:
Ajax is the abbreviation for asynchronous JavaScript and XML.
Ajax is not a new language or technology, it is actually a combination of several technologies in a certain way to play their role in the same collaboration, it includes
Standardized rendering using XHTML and CSS;
Use DOM to implement dynamic display and interaction;
Data exchange and processing using XML and XSLT;
Using XMLHttpRequest for asynchronous data reading;
Finally, bind and process all data with JavaScript;
Ajax works by adding a middle tier between the user and the server, enabling the user to respond asynchronously to the server. Not all user requests are submitted to the server, such as data validation and processing, which are given to the Ajax engine itself, and the Ajax engine submits the request to the server only if it is determined that the new data needs to be read from the server.
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