How to pass ajax request from an array collection Js

Hi Experts,

This is my html

<input type ='checkbox' data-param=1553066000000681004>

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. when  check box is checked i need to get the attribute value and pass it to ajax request . but in my page i have multiple check box like this and i get the value . but i cant pass this as ajax request bcoz its a array and i go for each function in jquery but it wont work . Please Take a look at my code

$boxes = $('input[type=checkbox]:checked');
if ($boxes.length == 1) {

$id = $(this).attr("data-param");
//do something
}else{
$boxes.each(function () {
$newid=[];
$newid=$(this).attr("data-param")+' ; ' ;

});
 $.post("contacts.aspx?id="+newid,
 function(data, status){
        alert(data);
    });
}

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