var values=[];
$('input[name="your-checkbox-name[]"]:checked').each(function () {
values[values.length] = (this.checked ? $(this).val() : "");
});$('input:checkbox').prop('checked', true);$('#selectChb').click(function(){
$(':checkbox').prop("checked", true);
});
$('.theClass:checkbox:checked')$('#select_all').change(function() {
var checkboxes = $(this).closest('form').find(':checkbox');
checkboxes.prop('checked', $(this).is(':checked'));
});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form>
<table>
<tr>
<td><input type="checkbox" id="select_all" /></td>
</tr>
<tr>
<td><input type="checkbox" name="select[]" /></td>
</tr>
<tr>
<td><input type="checkbox" name="select[]" /></td>
</tr>
<tr>
<td><input type="checkbox" name="select[]" /></td>
</tr>
</table>
</form>