jquery form input add 추가

<form name="form_1">
<form>

<script>
	var form = $('form[name="form_1"]');
        
        var input   = document.createElement('input');
        input.type   = 'hidden';
        input.name  = 'inx';
        input.value  = inx;

        form.appendChild(input);

</script>