ajaj.js

var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function () {
    if (xmlhttp.readyState !== 4) return;
    
    var res = JSON.parse(xmlhttp.response);
};
xmlhttp.open('POST', url, true);
xmlhttp.setRequestHeader('Content-type', 'application/json');
xmlhttp.send(params);


var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function () {
    if (xmlhttp.readyState !== 4) return;

    var res = JSON.parse(xmlhttp.response);
};
xmlhttp.open('GET', '/cogroup/namelist', true);
xmlhttp.send();