Shulou(Shulou.com)06/01 Report--

HTTP protocol

Traditional requests and Ajax requests

Ajax definition

Asynchronous JavaScript and XML. Ajax is asynchronous, and JavaScript programs want to communicate directly with the server without reloading the page.

Basic process of Ajax

1. Create a request object

Function requestObject () {if (window.XMLHttpRequest) {return new XMLHttpRequest ();} else if {return new ActiveXObject ('Mxsml2.XMLHTTP');} else {throw new Error ("Could not create HTTP request object.");}}

two。 Establish request

Var request=requestObject ()

Request.open ("GET", "data.txt", true)

3. Send a request

Request.send (null)

4. Processing requests (both XML and JSON formats)

Request.onreadystatechange=function () {if (request.readyState==4) {console.log (request.status+ ":" + request.statusText);}}

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