Java网页跳转与Action元素解析

<form   method= "post "   action= "1.jsp "   name= "frm1 "> 
<table   width= "100% "   border= "0 "   cellspacing= "0 "   cellpadding= "0 "> 
        <tr> 
            <td> <div   align= "center ">                     
                    <input   name= "add "   type= "button "   class= "button "   value= "增   加 "   onclick= "dopost( 'add ') "> 
                    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
                    <input   name= "edit "   type= "button "   class= "button "     value= "修   改 "   onclick= "dopost( 'modify ') "> 
                    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   &nbsp; 
                    <input   name= "del "   type= "button "   class= "button "   value= "删   除 "   onclick= "dopost( 'delete ') "> 
                    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
                    <input   name= "reset "   type= "reset "   class= "button "   value= "重   选 "> 
                </div> </td> 
        </tr> 
    </table> 
</form> 
<script   language=javascript> 
function   dopost(btname) 
{ 
if(btname   ==   "add ") 
{ 
      document.frm1.action= "x.jsp "; 
      document.frm1.submit(); 
} 
else 
{ 
..//类似 
} 
} 
</script>