作业下拉框效果

app/views/homework_common/index.html.erb

@@ -44,7 +44,7 @@
       <ul class="menu_r b_w" style="padding-left: 0px; margin-top: -5px;">
         <li>
           <a href="javascript:void(0);" class="menu_arrow" style="font-size:16px; color:#4b4b4b; font-weight: normal; padding-left: 0px;">作业</a>
-          <ul>
+          <ul style="max-height:240px; overflow-y:auto; overflow-x:hidden;">
             <% @homework_commons.each_with_index do |homework_common,index |%>
                 <li class="pr10">
                   <%= link_to "作业#{@homework_commons.count - index}：#{homework_common.name}",student_work_index_path(:homework => homework_common.id)%>