"Newbies must learn AJAX"
Introduction
update time：2018-01-201. Introduction to Ajax, advantages and disadvantages, application scenarios and technology
Introduction to Ajax:
Asynchronous Javascript And XML (Asynchronous JavaScript and XML)
It is not a single technology, but a combination that organically utilizes a series of technologies related to interactive web applications.
AJAX is a technology for creating fast, dynamic web pages. AJAX enables web pages to update asynchronously by exchanging small amounts of data with the server in the background. This means that parts of a web page can be updated without reloading the entire page.
advantage:
- The page does not refresh and the user experience is good.
- Asynchronous communication, faster response capability.
- Reduce redundant requests and reduce server load
-
Based on standardized and widely supported technology, no need to download plug-ins or applets
shortcoming:
- Ajax kills the back button, which destroys the browser's back mechanism.
- There are certain security issues.
- Support for search engines is relatively weak.
- Destroys the program's exception mechanism.
-
Unable to access
directly using URL
ajax application scenario
- Scenario 1. Data validation
- Scenario 2. Get data on demand
- Scenario 3. Automatically update the page
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