<script type="text/javascript">        function showItem() {                     var  win = window.open("2.html",null," height=300,width=450,  Left=300px,Top=20px, menubar=no,titlebar=no,scrollbar=no,toolbar=no, status=no,location=no");                }    </script>            <input type="button" id="txtId"/>        <input type="button" id="txtName"/>        <input type="button" id="btnShow" onclick="showItem();"  value="显示子窗体"/>

 <script language="javascript" type="text/javascript">       function check() {                  window.opener.document.getElementById("txtId").value="ID";              window.opener.document.getElementById("txtName").value="NAME";      }    </script>        <input type="button" id="btnSelect" onclick="check()"  value="选择"/>