关于给表格加一行的问题
比如我有如下这么个表格 
  <table>  
  <tr>  <td> 1 </td>  </tr>  
  </table>    
 现在js有这么一个字符串,如下: 
 var   s   =    " <tr>  <td> 2 </td>  </tr>  "   
 问题 
 如何吧字符串s加到这个表格中,使网页中看到的效果如下: 
  <table>  
  <tr>  <td> 1 </td>  </tr>  
  <tr>  <td> 2 </td>  </tr>  
  </table>  
------解决方案-------------------- <!DOCTYPE html PUBLIC  "-//W3C//DTD XHTML 1.0 Transitional//EN "  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">  
  <html xmlns= "http://www.w3.org/1999/xhtml ">  
  <head>  
  <meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 " />  
  <title> aaaa </title>  
  <link href= "css/css.css " rel= "stylesheet " type= "text/css " />  
  </head>  
  <body>  
  <table id= "tbl ">  
  <tr>  <td> 1 </td>  </tr>  
  </table>  
  <input type= "button " onclick= "cc() ">  
  <script>  
 function cc(){ 
 alert( 's ') 
 var a=document.getElementById( "tbl ") 
 var b=a.insertRow(1) 
 var c=b.insertCell() 
 c.innerHTML= " <tr>  <td> 2 </td>  </tr>  " 
 } 
  </script>  
  </body>  
  </html>