xhr.open( post url true) code example
Example: xhr post send
var xhr = new XMLHttpRequest();
var params = 'field1='+postfield1+'&field2='+postfield2;
xhr.open('POST', 'http://exmaple.com', true);
//Send the proper header information along with the request
xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
xhr.onload = function() {//Call a function when the state changes.
if(xhr.status == 200) {
alert(this.responseText);
}
}
xhr.send(params);