function ajax(options) {
options = options || {};
options.type = (options.type || "GET").toUpperCase();
options.dataType = options.dataType || "json";
options.timeout = options.timeout || 15000;
var params = options.formatParams ? formatParams(options.data) : options.data ;
if (window.XMLHttpRequest) {
var xhr = new XMLHttpRequest();
} else {
var xhr = new ActiveXObject('Microsoft.XMLHTTP');
}
xhr.onreadystatechange = function () {
if (xhr.readyState == 4) {
var status = xhr.status;
if (status >= 200 && status < 300) {
options.success && options.success(xhr.responseText, xhr.responseXML);
} else {
options.fail && options.fail(status);
}
}
}
if (options.type == "GET") {
xhr.open("GET", options.url, true);
xhr.send(null);
} else if (options.type == "POST") {
xhr.open("POST", options.url, true);
var contentType = options.contentType ? options.contentType : "application/x-www-form-urlencoded";
xhr.setRequestHeader("Content-Type", contentType);
xhr.send(params);
}
setTimeout(function(){
if(xhr.readyState!=4){
xhr.abort();
}
},options.timeout);
}