javascript 获取表格中td的值

function fetchTdValue(tableId){var table = document.getElementById(tableId);var trLength = table.rows.length;var tdLength = 0;var tr;var td;var tdValue = "";if(trLength){for(var i = 1;i<trLength;i++){tr = table.rows[i];tdLength = tr.cells.length;if(tdLength){for (var j=2;j<tdLength;j++){td = tr.cells[j];tdValue = tdValue + td.innerHTML+";";}}tdValue = tdValue +"@@@";}}return tdValue;}