val = i22;
function change2(val)
{
i22 = '<option value="a">2</option><option value="b">22</option> ';
i33 = '<option value="a">3</option><option value="b">33</option> ';
document.getElementById('trr').innerHTML = val;
}
如何把在trr中出现<option value="a">2</option><option value="b">22</option>
?