How does ajax implement calling

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The details are as follows:

Populate the data returned by url into the div of the specified id

Client: test.html

Function createXMLHttp () {var ret = null; try {ret = new ActiveXObject ('Msxml2.XMLHTTP');} catch (e) {try {ret = new ActiveXObject (' Microsoft.XMLHTTP');} catch (ee) {ret = null;}} if (! ret & typeof XMLHttpRequest! = 'undefined') ret = new XMLHttpRequest (); return ret;} function loadXmlToElement (fragment_url, element_id) {var element = document.getElementById (element_id) Element [XSS _ clean] ='

Data loading.'; var xmlhttp = createXMLHttp (); xmlhttp.open ("GET", fragment_url); xmlhttp.onreadystatechange = function () {if (xmlhttp.readyState = = 4 & & xmlhttp.status = = 200) {/ / alert (xmlhttp.responseXML.getElementsByTagName ("data") [0] .childNodes [0] .nodeValue); Element [XSS _ clean] = unescape (xmlhttp.responseXML.getElementsByTagName ("data") [0] .childNodes [0] .nodeValue) If (! element [XSS _ clean] | | Element [XSS _ clean] = "/ n") {try {Element [XSS _ clean] = unescape (xmlhttp.responseXML.firstChild.childNodes [1] .nodeValue);} catch (e) {}} xmlhttp.send (null);} var url= "t.xml"; / / alert (url); loadXmlToElement (url, "data")

Populate the data returned by url into the div of the specified id

Server:

Test.xml

Note that the server returns data in CDATA format, which can be any html code internally

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