table动态添加tr

//动态添加tr
            var tab = document.getElementById('tbtable');
            var n = document.getElementById('trStart').rowIndex + 1;
            var tr = tab.insertRow(n);
            var td = tr.insertCell(0);
            td.innerHTML = shtml1;
            var td2 = tr.insertCell(1);
            td2.innerHTML = shtml;