Untitled

<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>

<script>

const http = new XMLHttpRequest();
var response;
const url = 'http://page/';
http.open('get', url, false);
//Send the proper header information along with the request
http.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');

  http.onreadystatechange = function ()
    {
        if(http.readyState === 4)
        {
            if(http.status === 200 || http.status == 0)
            {
                let str = (http.responseText);
                let pattern =/\bgetObj\("Frm_Logintoken"\)\.value = "([^"]+)";/;
                let results = str.match(pattern)[1];
                alert(results)
                response = results;

            }

        }
    }

http.send();

var test;
setTimeout(function(){

const http1 = new XMLHttpRequest();
var params1 = 'frashnum=&action=login&Frm_Logintoken='+response+'&Username=admin&Password=test';
const url1 = 'http://page/';
http1.open('post', url, false);
//Send the proper header information along with the request
http1.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
test = params1;
http1.send(test);
alert(test)
}, 1000);

</script>
</body>
</html>