ボタンをクリックして、表の行を追加/削除します.

  
    

   
     <
   
     table width
   
     =
   
     "
   
     100%
   
     "
   
      border
   
     =
   
     "
   
     1
   
     "
   
      id
   
     =
   
     "
   
     tb
   
     "
   
     >
   
     

   
     <
   
     tr
   
     >
   
     

   
     <
   
     td
   
     >&
   
     nbsp;
   
     </
   
     td
   
     >
   
     

   
     <
   
     td
   
     >&
   
     nbsp;
   
     </
   
     td
   
     >
   
     

   
     <
   
     td
   
     >&
   
     nbsp;
   
     </
   
     td
   
     >
   
     

   
     <
   
     td
   
     >&
   
     nbsp;
   
     </
   
     td
   
     >
   
     

   
     </
   
     tr
   
     >
   
     

   
     <
   
     tr
   
     >
   
     

   
     <
   
     td
   
     >&
   
     nbsp;
   
     </
   
     td
   
     >
   
     

   
     <
   
     td
   
     >&
   
     nbsp;
   
     </
   
     td
   
     >
   
     

   
     <
   
     td
   
     >&
   
     nbsp;
   
     </
   
     td
   
     >
   
     

   
     <
   
     td
   
     >&
   
     nbsp;
   
     </
   
     td
   
     >
   
     

   
     </
   
     tr
   
     >
   
     

   
     <
   
     tr
   
     >
   
     

   
     <
   
     td
   
     >&
   
     nbsp;
   
     </
   
     td
   
     >
   
     

   
     <
   
     td
   
     >&
   
     nbsp;
   
     </
   
     td
   
     >
   
     

   
     <
   
     td
   
     >&
   
     nbsp;
   
     </
   
     td
   
     >
   
     

   
     <
   
     td
   
     >&
   
     nbsp;
   
     </
   
     td
   
     >
   
     

   
     </
   
     tr
   
     >
   
     

   
     <
   
     tr
   
     >
   
     

   
     <
   
     td
   
     >&
   
     nbsp;
   
     </
   
     td
   
     >
   
     

   
     <
   
     td
   
     >&
   
     nbsp;
   
     </
   
     td
   
     >
   
     

   
     <
   
     td
   
     >&
   
     nbsp;
   
     </
   
     td
   
     >
   
     

   
     <
   
     td
   
     >&
   
     nbsp;
   
     </
   
     td
   
     >
   
     

   
     </
   
     tr
   
     >
   
     

   
     </
   
     table
   
     >
   
     

   
     <
   
     p
   
     >
   
     

   
     <
   
     script
   
     >
   
     

   
     /*
   
     
 , , 

   
     */
   
     
function delrow(){
var i
   
     =
   
     tb.rows.length;
tb.deleteRow(i
   
     -
   
     1
   
     );
}
function addrow(){
 var tr 
   
     =
   
      document.createElement(
   
     '
   
     tr
   
     '
   
     );
 var cellsNum 
   
     =
   
      tb.rows[
   
     0
   
     ].cells.length;
 
   
     for
   
     (var j 
   
     =
   
      
   
     0
   
      ; j 
   
     <
   
      cellsNum ; j
   
     ++
   
     ){
 var td 
   
     =
   
      document.createElement(
   
     '
   
     td
   
     '
   
     );
 td.innerHTML
   
     =
   
     '
   
     test
   
     '
   
     ;
 tr.appendChild(td);
 }
 tb.tBodies[
   
     0
   
     ].appendChild(tr);
}

   
     </
   
     script
   
     >
   
     

   
     <
   
     input type
   
     =
   
     "
   
     submit
   
     "
   
      name
   
     =
   
     "
   
     Submit
   
     "
   
      value
   
     =
   
     "
   
      
   
     "
   
      onClick
   
     =
   
     "
   
     delrow();
   
     "
   
     >
   
     

   
     <
   
     input type
   
     =
   
     "
   
     submit
   
     "
   
      name
   
     =
   
     "
   
     Submit
   
     "
   
      value
   
     =
   
     "
   
      
   
     "
   
      onClick
   
     =
   
     "
   
     addrow();
   
     "
   
     >