how to get checked value of checkbox in jquery

1if ($('#check_id').is(":checked"))
2{
3  // it is checked
4}

1  $("#check").change(function () {
2            if (this.checked) {
3                //I am checked
4                name_val = $('#name').val();
5                $('#player').val(name_val);
6            } else {
7                //I'm not checked
8                $('#player').val('');
9            }
10        });