怎样获取预定义的table的行号和列号呢？很简单，只需要了解 table 的几个属性值用法即可。Table的总行数可以通过标记“tr” 得到，但是table的列数却不能直接获取，它需要借助 rows 通过标记“th” 和“td”得到。

为了更直观，下面以示例来说明如何得到行号和列号。点击 Id 为 'MyTable' 的表格的任意单元时，返回该单元的行号和列号！示例代码如下：

       function  getRowAndColumn()

       {

              if (!document.getElementsByTagName || !document.createTextNode) return;

              var rows = document.getElementById('MyTable').getElementsByTagName('tr');

              var cols;

              for (i = 0; i < rows.length; i++)

              {

                     rows[i].onclick = function()

                     {

                            alert("行:"+eval(this.rowIndex + 1));

                     }

                     if (i=0)

                     {

                            colsTH = rows[i].getElementsByTagName('th');

                            alert(colsTH.length);

                            for (k = 0; k< colsTH.length; k++)

                            {

                                   colsTH[k].onclick = function()

                                   {

                                          alert("列:"+eval(this.cellIndex +1));

                                   }

                            }

                     }

                     else

                     {

                            cols = rows[i].getElementsByTagName('td');

                            for (j = 0; j < cols.length; j++)

                            {

                                   cols[j].onclick = function()

                                   {

                                          alert("列:"+eval(this.cellIndex + 1));

                                   }

                            }

                     }

              }

       }

（注：关键代码已经加黑）