修复当鼠标移至区域内才会显示icon

app/views/layouts/_syllabus_base_info.html.erb

@@ -1,6 +1,6 @@
-<ul class="syllabus_leftinfo" id="all_syllabus_attr">
+<ul class="syllabus_leftinfo" id="all_syllabus_attr"  onmouseover="$('#signature_edit').show();" onmouseout="$('#signature_edit').hide();">
   <% if User.current.logged? && (User.current == syllabus.user || User.current.admin?) %>
-      <%= link_to image_tag("../images/signature_edit.png",width:"12px", height: "12px"), "javascript:void(0);", :class => 'fr', :onclick => "show_edit_base_info();"%>
+      <%= link_to image_tag("../images/signature_edit.png",width:"12px", height: "12px"), "javascript:void(0);", :id => 'signature_edit', :class => 'fr', :onclick => "show_edit_base_info();"%>
   <% end %>
   <div class="cl"></div>
   <li><label >创建教师：</label><span><%=syllabus.user.show_name %></span></li>