JSFiddle - React, Tailwind, and code Playground

HTML

<html>
    <body>
    one<input type="checkbox" name='checkbox0' value="one_name" checked>
   two<input type="checkbox" name='checkbox1' value="one_name1">
   three<input type="checkbox" name='checkbox2' value="one_name2">
        <input type="button" id="envoyer" value="Envoyer Reponse"  />

    </body>
</html>

JavaScript

$('#envoyer').click(function(e){
    var myArray=new Array(3);
for ( var j = 0; j < 3; j++) 
               { 
                var check=$('input:checkbox[name=checkbox'+j+']').is(':checked');
                if(check==true)
                myArray[j]=$('input:checkbox[name=checkbox'+j+']').val();
             
          }
                
    alert('check '+" "+myArray[i]);});