Full parsing of AJAX request methods: introduce various AJAX request methods in detail, and specific code examples are required
introduction:
In modern Web development, AJAX (Asynchronous JavaScript and XML) has become an indispensable technology. It can send requests and receive data returned by the server asynchronously, so that users can obtain the latest data in real time without refreshing the entire page. This article will introduce various AJAX request methods in detail, and provide specific code examples to help readers better understand and apply this technology.
1、 AJAX request mode:
- GET request:
GET request is the most commonly used AJAX request method, which is used to obtain data from the server. When a GET request is used, the data will be appended to the URL and sent to the server in the form of a query string.
The example code is as follows:
$.ajax({ url: ' http://example.com/api ', type: 'GET', success: function(data){ //Data returned after processing successfully }, error: function(error){ //Processing request error } });
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- POST request:
POST requests are used to submit data to the server. Unlike GET requests, POST requests send data to the server in the request body, rather than in the URL.
The example code is as follows:
$.ajax({ url: ' http://example.com/api ', type: 'POST', data: { Name: 'Zhang San', age: 18 }, success: function(data){ //Data returned after processing successfully }, error: function(error){ //Processing request error } });
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- PUT request:
The PUT request is used to update the resources on the server. Similar to the POST request, the PUT request also places the data in the request body and sends it to the server.
The example code is as follows:
$.ajax({ url: ' http://example.com/api/1 ', type: 'PUT', data: { Name: 'Li Si', age: 20 }, success: function(data){ //Data returned after processing successfully }, error: function(error){ //Processing request error } });
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- DELETE request:
The DELETE request is used to delete resources on the server. The DELETE request has no request body. You only need to specify the URL of the resource to be deleted.
The example code is as follows:
$.ajax({ url: ' http://example.com/api/1 ', type: 'DELETE', success: function(data){ //Data returned after processing successfully }, error: function(error){ //Processing request error } });
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2、 Resolution of AJAX request common parameters:
- Url: the URL address of the request.
- Type: the type of request, such as GET, POST, PUT, and DELETE.
- Data: The data sent by the request. It can be a query string or a JSON object.
- Success: the callback function when the request succeeds.
- Error: The callback function when the request fails.
- BeforeSend: the function called before sending the request.
- Complete: The function called after the request is completed.
3、 Example of AJAX request:
The following example demonstrates a simple AJAX request implementation, obtaining data from the server through a GET request, and displaying the returned data on the page.
HTML part:
<! DOCTYPE html> <html> <head> <title>Example of AJAX request</title> <script src=" https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js "></script> </head> <body> <div id="output"></div> <script> $.ajax({ url: ' http://example.com/api ', type: 'GET', success: function(data){ //Display the returned data on the page $('#output').text(data); }, error: function(error){ Console. log ('request error ', error); } }); </script> </body> </html>
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4、 Summary:
This article details the common request methods of AJAX, including GET, POST, PUT, and DELETE, and provides corresponding code examples. By learning and understanding these request methods, we can more flexibly apply AJAX technology to achieve data interaction with the server. AJAX has become an important tool in modern Web development. I hope this article can help readers to master AJAX technology.
The above is a detailed explanation of various AJAX request methods: comprehensive analysis of the details of AJAX request methods, please pay more attention to other relevant articles on php!
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