function json2url(json) {    var arr = [];    for (var name in json) {        arr.push(name+'='+encodeURIComponent(json[name]));    }    return arr.join('&');}function ajax(json) {    json.data = json.data || {};    json.data.t = Math.random();    json.type = json.type || 'GET';    if (window.XMLHttpRequest) {        var oAjax = new XMLHttpRequest();    } else {        var oAjax = new ActiveXObject('Microsoft.XMLHTTP');    }    switch (json.type.toLowerCase()) {        case 'get':            oAjax.open('GET', json.url + '?' + json2url(json.data), true);            oAjax.send();            break;        case 'post':            oAjax.open('POST', json.url, true);            oAjax.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');            oAjax.send(json2url(json.data));    }    oAjax.onreadystatechange = function () {        if (oAjax.readyState == 4) {            if (oAjax.status >= 200 && oAjax.status < 300 || oAjax.status == 304) {                json.success && json.success(oAjax.responseText);            } else {                json.erro && json.erro(oAjax.status);            }        }    };}