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function createAjax() {
var req;
if(window.XMLHttpRequest) {
req = new XMLHttpRequest();
}else if(window.ActiveXObject) {
req = new ActiveXObject(Microsoft.XMLHTTP);
}
return req;
}
function sendAjaxReq(method,url,param,asychn,handle200,handle404,handle500,loading) {
var req = createAjax();
req.onreadystatechange = function() {
if(req.readyState == 4) {
if(req.status == 200) {
if(handle200) {
handle200(req.responseText);
}
}else if(req.status == 404) {
if(handle404) {
handle404;
}
}else if(req.status == 500) {
if(handle500) {handle500;
}
}
} else {if(loading) {loading();
}
}
}
if(method.toLowerCase() == "get") {
req.open(method,url+(param==null?"":"?"+param),asychn);req.send(null);
}else if(method.toLowerCase() == "post") {
req.open(method,url,asychn);
req.sendRequestHeader("Content-Type","application/x-www-form-urlencoded");
req.send(param);}
}