window.onload = function(){
	document.body.addEventListener("mousemove",(e)=>{
		var timeInMs = Date.now();
		document.querySelector("#log").innerHTML = navigator.userAgent + "<br>" + "x=" + e.offsetX  + "y=" + e.offsetY;
		var data = {timeInMs:timeInMs,userAgent:navigator.userAgent,x:e.offsetX,y:e.offsetY};
		move_xy(data).then(function(response){
			console.log(response);
		});
		
	});
};

async function move_xy(data){
	return await new Promise(function(resolve) {$.ajax({
		type: "POST",
		dataType: "json",
		url: "./move_xy.php",
		data: data,
		success: function (response) {
			if(response.res==="ok"){
				
				resolve(response);
			}
			resolve(false);
		},
		error:function(XMLHttpRequest, textStatus, errorThrown){
			resolve(false);
		}
	});});
}

<?php
$obj["timeInMs"] = $_POST["timeInMs"];
$obj["userAgent"] = $_POST["userAgent"];
$obj["x"] = $_POST["x"];
$obj["y"] = $_POST["y"];
$obj["res"] = "ok";

print json_encode($obj);