<script language="javascript" type="text/javascript"> function createXMLHttpRequest() { var request = false; if(window.XMLHttpRequest) { request = new XMLHttpRequest(); if(request.overrideMimeType) { request.overrideMimeType(‘text/xml‘); } } else if(window.ActiveXObject) { var versions = [‘Microsoft.XMLHTTP‘, ‘MSXML.XMLHTTP‘, ‘Microsoft.XMLHTTP‘, ‘Msxml2.XMLHTTP.7.0‘, ‘Msxml2.XMLHTTP.6.0‘, ‘Msxml2.XMLHTTP.5.0‘, ‘Msxml2.XMLHTTP.4.0‘, ‘MSXML2.XMLHTTP.3.0‘, ‘MSXML2.XMLHTTP‘]; for(var i=0; i<versions.length; i++) { try { request = new ActiveXObject(versions[i]); if(request) { return request; } } catch(e) {} } } return request; } function ajax(xmlhttp,_method, _url, _param, _callback) { if (typeof xmlhttp == ‘undefined‘) return; xmlhttp.onreadystatechange = function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { _callback(xmlhttp); } } xmlhttp.open(_method, _url, true); if (_method == "POST") { xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); xmlhttp.setRequestHeader("Content-Length", _param.length); xmlhttp.send(_param); } else { xmlhttp.send(null); } } //使用举例 var xmlhttp = createXMLHttpRequest(); var t1; //用来作超时处理 function adduserok(request) { alert(request.responseText); document.getElementById("abc").innerHTML = request.responseText; alert(document.getElementById("abc").name); if (t1) clearTimeout(t1); } function connecttoFail() { if (xmlhttp) xmlhttp.abort(); alert (‘Time out‘); } if (xmlhttp) { var parameta="ordertype=1&search=1&searchtype=content&catid=183&keywords="+EncodeURI("{$title}"); ajax(xmlhttp,"POST", "/yczx/searchmore.php",parameta,adduserok); t1 = setTimeout(connecttoFail,3000); } else { alert ("Init xmlhttprequest fail"); } </script>
原文:http://www.cnblogs.com/wawahaha/p/4849301.html