function addOne() {??????????? var tbody = document.getElementById('table').lastChild; ???????????? var addtr = document.createElement("tr");??????????? var addtd1 = document.createElement("td");??????????? var addtd2 = document.createElement("td");??????????? var addtd3 = document.createElement("td");??????????? addtd1.innerHTML="<input type="text"/>";??????????? addtd2.innerHTML="<input type="text"/>";??????????? addtd3.innerHTML="<a href="javascript:;" onclick="deleteRow(this)">刪除</a>";??????????? addtr.appendChild(addtd1);??????????? addtr.appendChild(addtd2);??????????? addtr.appendChild(addtd3);??????????? tbody.appendChild(addtr);??????? }錯在哪里，添加一行失敗。