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

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

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

The XMLHttpRequest (XHR) object is used to interact with the server. XMLHttpRequest allows you to request a specific URL to get data without refreshing the page. This allows the web page to update the local content of the page without affecting the user's operation. XMLHttpRequest is widely used in AJAX programming.

XMLHttpRequest provides to update the web page without reloading the page, request data from the server at the client after the page is loaded, accept the data at the server after the page is loaded, and send the 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 from the Web server synchronously or asynchronously, and the content can be returned as text or an DOM document.

Although it is called XMLHttpRequest, it is not limited to use with XML documents: it can receive text documents in any form.

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