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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