// method : 请求方式 POST/GET;

// url:     如果为GET方式的话url里面要带参数

// obj:     准备好的容器,方便储存拿到的数据

function xhr ($method, $url, obj)

{

  var Request = new XMLHttpRequest();

  Request.open($method, $url);

  Request.setRequestHeader("CONTENT-TYPE", "application/x-www-from-urlencoded");

  Request.send();

  Request.onreadystatechange = function ()

  {

    if (Request.readyState === 4 && Request.status === 200) {

      obj.innerHTML = Request.responseText;

    } else {

      obj.innerHTML = Request.status;

    }

  }

}