<p id="field_results"></p><br>
<input type="checkbox" value="1">1<br>
<input type="checkbox" value="2">2<br>
<input type="checkbox" value="3">3

var Dizi = new Array();
$(document).ready(function(){
        var sayilar = new Array();
    $("input:checkbox").click(function() {
           var deger =  $(this).val();
        var index = Dizi.indexOf(deger);
        if (index !== -1){
            Dizi.splice(index, 1);
        }else{
            Dizi.push(deger);
        }
        document.getElementById("field_results").innerHTML = Dizi.join(",");
    });
});