What is the core of ajax

The core of ajax is the data acquisition technology "XMLHttpRequest", which is an object of JavaScript. Through XMLHttpRequest, you can request a specific URL and obtain data without refreshing the page, so that the web page can update the partial content of the page without affecting the user's operation.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

The core of ajax is the data acquisition technology "XMLHttpRequest", which is an object of JavaScript.

XMLHttpRequest (XHR) object is used to interact with the server. Through XMLHttpRequest, you can request a specific URL and obtain data without refreshing the page. This allows web pages to update partial content of the page without affecting user operations. XMLHttpRequest is widely used in AJAX programming.

XMLHttpRequest provides the ability to update web pages without reloading the page. After the page is loaded, the client requests data from the server. After the page is loaded, the server accepts the data. Send data to the client in the background.

The XMLHttpRequest object provides full access to the HTTP protocol, including the ability to make POST and GET requests.

XMLHttpRequest can return the response of the Web server synchronously or asynchronously, and can return content in the form of text or a DOM document.

Despite the name XMLHttpRequest, it is not limited to use with XML documents: it can accept any form of text document.

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