What are the advantages of ajax
The advantages of ajax are: 1. Update data without refreshing, allowing web applications to respond to user interactions more quickly, reducing user waiting time, and bringing a very good user experience; 2. Asynchronous communication with the server ; 3. Front-end and back-end load balancing; 4. Widely supported based on standards; 5. Separation of interface and application, which is conducive to division of labor and cooperation, improvement of efficiency, etc.
The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.
Ajax is Asynchronous Javascript And XML (asynchronous JavaScript and XML).
ajax is a technology that can update parts of a web page without reloading the entire web page.
ajax is a technology used to create fast dynamic web pages. By exchanging small amounts of data with the server in the background. Ajax allows web pages to be updated asynchronously. This means that parts of a web page can be updated without reloading the entire page. If traditional web pages (which do not use ajax) need to update content, the entire web page must be reloaded.
Advantages of ajax
1. No refresh to update data.
The biggest advantage of AJAX is that it can communicate with the server to maintain data without refreshing the entire page. This allows web applications to respond to user interactions more quickly and avoids sending unchanged information over the network, reducing user waiting time and bringing a very good user experience.
2. Asynchronous communication with the server.
AJAX uses an asynchronous method to communicate with the server, without interrupting the user's operation, and has a faster response capability. Optimizes the communication between Browser and Server, reducing unnecessary data transmission, time and data traffic on the network.
3. Front-end and back-end load balancing.
AJAX can transfer some of the work previously burdened by the server to the client, using the client's idle capabilities to process it, reducing the burden on the server and bandwidth, and saving space and broadband rental costs. And to reduce the burden on the server, the principle of AJAX is to "get data on demand", which can minimize the burden on the server caused by redundant requests and responses and improve site performance.
4. Widely supported based on standards.
AJAX is based on standardized and widely supported technology and does not require downloading browser plug-ins or applets, but requires the customer to allow JavaScript to execute on the browser. As Ajax matures, some program libraries that simplify the use of Ajax have also come out. Likewise, another assistive programming technology has emerged to provide alternative functionality for users who do not support JavaScript.
5. Separation of interface and application.
Ajax separates the interface and application in the WEB (which can also be said to separate data and presentation), which is conducive to division of labor and cooperation, reduces WEB application errors caused by non-technical personnel modifying the page, improves efficiency, and also More suitable for current publishing systems.
Although it has such advantages, there are always disadvantages
Disadvantages of AJAX
1. AJAX does not support mobile devices well.
Some handheld devices (such as mobile phones, PDAs, etc.) currently do not support Ajax very well. For example, when we open a website using Ajax technology on the mobile phone's browser, it currently does not support it.
2. Weak support for search engines.
The support for search engines is relatively weak. If used improperly, AJAX will increase network data traffic, thus reducing the performance of the entire system.
3. AJAX security issues.
AJAX technology not only brings a good user experience to users, but also brings new security threats to IT companies. Ajax technology is like establishing a direct channel for enterprise data. This allows developers to inadvertently expose more data and server logic than before. Ajax logic can be hidden from client-side security scanning technologies, allowing hackers to create new attacks from remote servers. Ajax is also difficult to avoid some known security weaknesses, such as cross-site scripting attacks, SQL injection attacks, and Credentials-based security vulnerabilities, etc.
4. Ajax's non-refresh reload, because the page changes are not as obvious as the refresh reload, so it is easy to cause trouble to the user - when the user does not know the current data, the experience has been updated. ; Current solutions include prompts at relevant locations, more obvious design of data update areas, and prompts to users after data updates, etc.
[Related tutorial recommendations: AJAX video tutorial]
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