原生js xmlhttprequest.txt

function http_post(url, data, callback) {
  var sp = typeof Spinner == 'function' ? new Spinner({color:'#000', lines: 12}).spin(document.body) : null;
    var request = new XMLHttpRequest();
    //调用XMLHttpRequest对象的open方法
    request.open('POST', url);
    //调用XMLHttpRequest对象的send方法
    var fd = new FormData();
    for(var attr in data) {
      fd.append(attr,data[attr]);
    }
    request.send(fd);
    //为XMLHttpRequest对象添加onreadystatechange 响应函数
    request.onreadystatechange = function() {
        //判断响应是否完成：XMLHttpRequest 对象的readystate的属性值为4的时候
        if (request.readyState == 4) {
            sp && sp.stop();
            //在判断响应是否可用：XMLHttpRequest 对象status 属性值为200
            if (request.status == 200) {
                //响应结果
                callback(request.responseText);
            }
        }
    }
}