fix bug

app/helpers/exercises_helper.rb

@@ -734,6 +734,6 @@ module ExercisesHelper
 
   #实训题学生代码的行数
   def content_line(content)
-    content.split(/\r?\n/).length
+    content.split(/\r?\n/).length + 1
   end
 end

app/templates/exercise_export/exercise_export.css

@@ -315,7 +315,6 @@ table td{
 /*}*/
 textarea{
     width:100%;
-    height:100%;
     resize:none;
     border:none;
     background-color:#eee;

app/templates/exercise_export/exercise_user.html.erb

@@ -322,6 +322,7 @@
                         <% else %>
                             <%  latest_code = game.try(:lastest_code) %>
                           <% end %>
+                        <% con_rows = content_line(latest_code) %>
                         <div class="mbt20">
                           <p class="bgc" >
                               <span class="pd10" style="display:inherit;">
@@ -330,7 +331,7 @@
                               </span>
                           </p>
                           <div class="bg-e pd10">
-                            <textarea class="" id="content_show_<%= game.id %>" name="content"><%= latest_code %></textarea>
+                            <textarea class="" id="content_show_<%= game.id %>" name="content" rows="<%= con_rows %>">><%= latest_code %></textarea>
                           </div>
                         </div>
                       </div>