Understanding Ajax step by step (3)

Ajax is generally used for user form data verification and partial update, such as paging.
Advantages and disadvantages of AJAX
Advantages:
1. the asynchronous processing function allows you to submit data selectively;
2. Partial update;
3. Less server load;
4. faster response speed;
5. Reduce bandwidth pressure.
Disadvantages:
1. Partial update does not support the back-up and add-to-favorites functions;
2. Search engines do not support Ajax crawling;
3. Poor cross-platform performance;
4. Not all browsers support Ajax;
5. the browser supports ajax to varying degrees.

The example is not given one by one. The first two articles of Ajax are mainly about how to understand Ajax. This article describes the Ajax technology under what circumstances, ajax combines HTML, CSS, XML, Dom, and other technologies to reflect powerful functions and effects...