html弹出窗口

<script language="javascript" type="text/javascript">
           alert("请登录");
           window.location.href="/postgraduate/page/daemonpage/login/login.jsp"; //不打开新的窗口，
    </script>


<script language="javascript" type="text/javascript">
      function guanzhuclick() {
       window.open("${pageContext.request.contextPath}/IPOpoint_pointzz_pointgz.action"); //打开新的窗口
      }
         
    </script>