如何在单击下拉菜单按钮时打开一个窗口

Question

单击按钮组中的pdf in按钮

下拉按钮的HTML代码

<div class="btn-group">
  <a class="btn btn-primary dropdown-toggle" data-toggle="dropdown" href="#">
 Button Primary
 <span class="caret"></span>
</a>
<ul class="dropdown-menu">
   <li><a  onclick="open_win()">Button Secondary</a></li>
</ul>
</div>

onclick的javascript部分是

<c:url var="pdfGenerationUrl" value="/data/acess"/>
<script>
    function open_win (){

        $('#reportIds').attr("action","${pdfGenerationUrl}");
        $('#reportIds').submit();   
    }
</script>

如何在点击open_win上打开一个新窗口