创建ajax方法
下面来看看这一款比较有个性的ajax创建方法吧，利用xmlhttp创建判断哦。
var xmlHttp;
function makeRequest(queryString) {
var msXml = new Array();
msXml[0] = "Microsoft.XMLHTTP";
msXml[1] = "MSXML2.XMLHTTP.5.0";
msXml[2] = "MSXML2.XMLHTTP.4.0";
msXml[3] = "MSXML2.XMLHTTP.3.0";
msXml[4] = "MSXML2.XMLHTTP";
if (window.xmlHttpRequest) {
xmlHttp = new XMLHttpRequest();
} else {
for (var i = 0; i < msXml.length; i++) {
try {
xmlHttp = new ActiveXObject(msXml[i]);
break;
} catch (e) {
xmlHttp = new xmlHttpRequest();
}
}
}
xmlHttp.onreadystatechange = getRequest;
xmlHttp.open('post', 'seo.php', true);
xmlHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
xmlHttp.send(queryString);
}
function getRequest() {
if(xmlHttp.readyState==4) {
if(xmlHttp.status==200) {
$('seo_result').innerHTML = xmlHttp.responseText;
}
}
}
补充：网页制作,js教程 
