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Problems with Ajax asynchronous requests in the XMLHttpRequest object
Problems with Ajax asynchronous requests in the XMLHttpRequest object
XMLHttpRequestObject
1. XMLHttpRequest object
1.Ajax can realize asynchronous transmission, so It relies on XMLHttpRequest in JavaScript
2. The XMLHttpRequest object is the object of the XMLHttp component. It is an abstract object that allows the script to obtain the returned eXML data from the server or send the data to the server.
3.XMLHttpRequest can realize only data-level interaction between the client and the server without having to refresh the page every time
4.XMLHttpRequest was first provided as an ActiveX control in Microsoft Internet Explorer 5.0 and has since been widely used
5.You need to create an XMLHttpRequest object before using XMLHttpRequest to send a request and process the response.
6.XMLHttpRequest is not a W3C standard and can be created using JavaScript in a variety of ways. XMLHttpRequest instance
7.XMLHttpRequest is implemented as an ActiveX control in IE, while other browsers implement it as a JavaScript built-in object
2. XMLHttpRequest object creation
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