【JSTL】c:choose用法

<c:choose>
    <c:when test="${x.attachPath!=null&&x.attachPath!=''}">
        <a href="http://service.huadongdata.net/boyun/${x.attachPath}" class="u_btn1"  target="_blank">查看</a>
    </c:when>
    <c:otherwise>
      <%--  <a class="u_btn1"   target="_blank">无附件</a>--%>
        <a href ="javascript:return false;" onclick="return false;" style="cursor: default;">无附件</a>
    </c:otherwise>
</c:choose>