ajax 验证用户名实例代码
function ajax(url,id,h) {
var xmlhttp = false;
try {
xmlhttp = new activexobject("msxml2.xmlhttp");
} catch (e) {
try {
xmlhttp = new activexobject("microsoft.xmlhttp");
} catch (e2) {
xmlhttp = false;
}
}
if (!xmlhttp && typeof xmlhttprequest != 'undefined') {
xmlhttp = new xmlhttprequest();
}
xmlhttp.open("get", url, true);
xmlhttp.onreadystatechange = function(){
if (xmlhttp.readystate < 4 && id) {
document.getelementbyid(id).innerhtml="请稍候...";
}
if (xmlhttp.readystate == 4 && h) {
var response = xmlhttp.responsetext;
eval(h+'("'+response+'")');
}
};
xmlhttp.send(null);
}function w(a){
$i('pvsum').innerhtml = a;
}
function pvs(){
ajax('?action=index&pv=yes','','w');
t=settimeout("pvs()",30000)
}