点击打开测验作品列表中某作品，在作品详情页面增加返回统计列表的快捷操作

app/views/exercise/_exercise_student_result.html.erb

@@ -20,7 +20,11 @@
       <div class="testDesEdit mt5"><%= exercise.exercise_description.nil? ? "" : exercise.exercise_description.html_safe%></div>
       <div class="cl"></div>
     </div>
-    <div class="mb5">得分：<span class="c_red"><%=exercise_user.score %>分</span></div>
+    <div>
+        <div class="fl mb5">得分：<span class="c_red"><%=exercise_user.score %>分</span></div>
+        <%= link_to '返回统计列表>>',student_exercise_list_exercise_path(exercise.id,:course_id => exercise.course.id) , :class => "fr linkBlue" %>
+    </div>
+    <div class="cl"></div>
     <% mc_question_list = exercise.exercise_questions.where("question_type=1") %>
     <% mcq_question_list = exercise.exercise_questions.where("question_type=2") %>
     <% single_question_list = exercise.exercise_questions.where("question_type=3") %>