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var xhr = new XMLHttpRequest();
xhr.open("POST", "/service", true);
xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");
var a = document.getElementById("post_param_a").value;
var b = document.getElementById("post_param_b").value;
var params = "a=" + a + "&b=" + b;
xhr.send(params);
xhr.onload = function() {
    var r = xhr.responseText;
    document.getElementById("response_text").innerText = r;
}

var xhr = new XMLHttpRequest(); xhr.open("POST", "/service", true); xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded"); var a = document.getElementById("post_param_a").value; var b = document.getElementById("post_param_b").value; var params = "a=" + a + "&b=" + b; xhr.send(params); xhr.onload = function() { var r = xhr.responseText; document.getElementById("response_text").innerText = r; }