var tab = document.createElement("TABLE");
var tr = tab.insertRow(0);
var td = tr.insertCell(0);
td.innerHTML = "用户名";
var td = tr.insertCell(1);
td.innerHTML = "<input>";
var tr = tab.insertRow(0);
var td = tr.insertCell(0);
td.innerHTML = "用户名";
var td = tr.insertCell(1);
td.innerHTML = "<input>";
var tr = tab.insertRow(0);
var td = tr.insertCell(0);
td.innerHTML = "用户名";
var td = tr.insertCell(1);
td.innerHTML = "<input>";
document.body.appendChild(tab);