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Master the detailed explanation of commonly used Ajax functions and their parameters
Ajax (Asynchronous JavaScript and XML) is a method used to asynchronously transmit data between the client and the server. technology. It can update part of the content without refreshing the entire page, improving user experience and performance. This article will introduce commonly used Ajax functions and their parameters in detail, with specific code examples.
1. XMLHttpRequest object
The core of Ajax is the XMLHttpRequest object, which is a built-in object provided by the browser. By creating an XMLHttpRequest object, we can interact with the server data.
Sample code:
let xhr = new XMLHttpRequest();
2. Basic operations of Ajax
Sample code:
xhr.open('GET', 'http://example.com/api', true);
Sample code:
xhr.setRequestHeader('Content-Type', 'application/json'); xhr.send(JSON.stringify({ name: 'John', age: 18 }));
Sample code:
xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { console.log(xhr.responseText); } };
3. Encapsulation of Ajax functions
In order to simplify the use of Ajax, we can encapsulate a general Ajax function.
Sample code:
function ajax(options) { let xhr = new XMLHttpRequest(); xhr.open(options.method, options.url, true); xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { options.success(xhr.responseText); } else { options.error(xhr.status); } }; xhr.send(options.data); }
4. Detailed explanation of the parameters of the Ajax function
The Ajax function can accept an options object containing various configurations as a parameter.
Sample code:
ajax({ method: 'POST', url: 'http://example.com/api', data: JSON.stringify({ name: 'John', age: 18 }), success: function(response) { console.log(response); }, error: function(statusCode) { console.error('Error:', statusCode); } });
By mastering commonly used Ajax functions and their parameters, we can interact with data more flexibly and improve user experience and performance. I hope that the detailed explanations and examples in this article can help readers deeply understand the working principle and application method of Ajax.
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