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我們可以透過JavaScript動態修改表單的action值來達成

<SCRIPT language="JavaScript">

function OnSubmitForm()

{

  if(document.pressed == 'Insert')

  {

   document.myform.action ="insert.html";

  }

  else

  if(document.pressed == 'Update')

  {

    document.myform.action ="update.html";

  }

  return true;

}

</SCRIPT>



<FORM name="myform" onSubmit="return OnSubmitForm();">

<INPUT TYPE="SUBMIT" name="Operation" onClick="document.pressed=this.value" VALUE="Insert">

<INPUT TYPE="SUBMIT" name="Operation" onClick="document.pressed=this.value" VALUE="Update">

</FORM> 

參考資料
How to switch the 'action' field in an HTML form dynamically