如何在JS中设置表格的class为tit2?

Question

className="tit2"
参考htmlref手册

Answer 1

<style type="text/css">
.tit2{
background:#3300FF;
}
</style>
<script>
function addtr(){
document.getElementsByTagName("table")[0].insertRow()
document.getElementsByTagName("table")[0].className="tit2"
}</script>
<table width="500" border="1" cellspacing="0" cellpadding="0">
  <tr>
    <td height="80" bgcolor="#FFFF33">&nbsp;</td>
  </tr>
</table>
<br><br>
<input value="添加tr" type="button" onclick="addtr()" />

Answer 2

var oTable=document.getElementById("<tableid>");
var oTr=oTable.insertRow(0);
document.all?oTr.className="tit2"
            :oTr.setAttribute("class","tit2");

Answer 3

function Button2_onclick() {
    var table = document.getElementById('tableId');
    var n = table.rows.length;
    var newRow = table.insertRow(n);
    newRow.className = "tit2";
    for(var i = 0; i < table.rows(0).cells.length; i++)
    {
        newRow.insertCell(i);
        newRow.cells[i].innerText ="text" + i;        
    } 
}

Answer 4

document.getElementsByTagName("table")[0].insertRow()
document.getElementsByTagName("table")[0].className="tit2"
与
newRow.className = "tit2"; 
都可以.