diff --git a/public/react/src/modules/courses/Index.js b/public/react/src/modules/courses/Index.js
index 1b1c523c0..7da04dd0e 100644
--- a/public/react/src/modules/courses/Index.js
+++ b/public/react/src/modules/courses/Index.js
@@ -1,6 +1,7 @@
 import React, { Component } from 'react';
 import { SnackbarHOC } from 'educoder';
 import {BrowserRouter as Router,Route,Switch} from 'react-router-dom';
+import { withRouter } from 'react-router'
 import Loadable from 'react-loadable';
 import Loading from '../../Loading';
 import axios from 'axios';
@@ -309,6 +310,13 @@ class CoursesIndex extends Component{
 
     componentDidMount(){
         // this.updataleftNav()
+        this.historyArray = []
+        this.props.history.listen( location =>  {
+			console.log(location)
+            this.historyArray.unshift(location.pathname)
+            this.historyArray.length = 2;
+			//Do your stuff here
+		});
     }
 
     updataleftNav=()=>{
@@ -443,6 +451,7 @@ class CoursesIndex extends Component{
 
     render() {
         const common = {
+            previousPathName: this.historyArray && this.historyArray[1]
             // isAdmin: this.isAdmin,
             // isStudent: this.isStudent,
             // isAdminOrStudent: this.isAdminOrStudent,
@@ -464,47 +473,47 @@ class CoursesIndex extends Component{
               {/*毕设任务题库详情*/}
               <Route path="/banks/gtopic_topics/:workid"
                      render={
-                       (props) => (<Completetaskpage {...this.props} {...props} {...this.state} />)
+                       (props) => (<Completetaskpage {...this.props} {...props} {...this.state} {...common}/>)
                      }
               ></Route>
               {/*毕设内容题库详情*/}
               <Route path="/banks/gtask_topics/:workid"
                      render={
-                       (props) => (<CompletetopicdePage {...this.props} {...props} {...this.state} />)
+                       (props) => (<CompletetopicdePage {...this.props} {...props} {...this.state} {...common}/>)
                      }
               ></Route>
               {/*分组作业题库详情*/}
               <Route path="/banks/group_topics/:workid"
                      render={
-                       (props) => (<GroupjobbankPage {...this.props} {...props} {...this.state} />)
+                       (props) => (<GroupjobbankPage {...this.props} {...props} {...this.state} {...common}/>)
                      }
               ></Route>
               {/*  普通作业题库详情*/}
               <Route path="/banks/normal_topics/:workid"
                      render={
-                       (props) => (<Generaljobbankdetails {...this.props} {...props} {...this.state} />)
+                       (props) => (<Generaljobbankdetails {...this.props} {...props} {...this.state} {...common}/>)
                      }
               ></Route>
                 {/* 资源列表页  */}
                 <Route path="/courses/:coursesId/file/:Id" exact
                        render={
-                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} />)
+                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
                 <Route path="/courses/:coursesId/files/:main_id"
                        render={
-                         (props) => (<ListPageIndex {...this.props} {...props} {...this.state} />)
+                         (props) => (<ListPageIndex {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
                 <Route exact path="/courses/:coursesId/boards/:boardId"
                     render={
-                        (props) => (<ListPageIndex {...this.props} {...props} {...this.state} />)
+                        (props) => (<ListPageIndex {...this.props} {...props} {...this.state} {...common}/>)
                     }
                 ></Route>
                 {/*课堂讨论*/}
                 <Route path="/courses/:coursesId/boards/:boardId"
                        render={
-                           (props) => (<BoardIndex {...this.props} {...props} {...this.state} />)
+                           (props) => (<BoardIndex {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
@@ -512,19 +521,19 @@ class CoursesIndex extends Component{
                 {/* 毕设问答 */}
                 <Route path="/courses/:coursesId/graduation_topics/postwork/new"
                        render={
-                           (props) => (<GraduateTopicPostWorksNew {...this.props} {...props} {...this.state} />)
+                           (props) => (<GraduateTopicPostWorksNew {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
                 {/* 毕设选题新建页 */}
                 <Route path="/courses/:coursesId/graduation_topics/new"
                        render={
-                           (props) => (<GraduateTopicNew {...this.props} {...props} {...this.state} />)
+                           (props) => (<GraduateTopicNew {...this.props} {...props} {...this.state} {...common}/>)
                        }></Route>
                 {/* 毕设选题编辑页*/}
                 <Route path="/courses/:coursesId/graduation_topics/:topicId/edit"
                        render={
-                           (props) => (<GraduateTopicNew {...this.props} {...props} {...this.state} />)
+                           (props) => (<GraduateTopicNew {...this.props} {...props} {...this.state} {...common}/>)
                        }></Route>
 
                 {/* 毕设选题详情页 */}
@@ -537,7 +546,7 @@ class CoursesIndex extends Component{
                 {/* 毕设选题列表 */}
                 <Route path="/courses/:coursesId/graduation_topics/:Id" exact
                        render={
-                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} />)
+                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} {...common}/>)
                        }></Route>
 
 
@@ -545,21 +554,21 @@ class CoursesIndex extends Component{
                 {/* 作品评阅 https://www.trustie.net/issues/19981 */}
                 <Route path="/courses/:coursesId/graduation_tasks/:category_id/appraise"
                        render={
-                           (props) => (<GraduationTasksappraise {...this.props} {...props} {...this.state} />)
+                           (props) => (<GraduationTasksappraise {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
                 {/* 新建作品 */}
                 <Route path="/courses/:coursesId/graduation_tasks/:category_id/:task_Id/works/new"
                        render={
-                           (props) => (<GraduationTasksSubmitnewApp {...this.props} {...props} {...this.state} />)
+                           (props) => (<GraduationTasksSubmitnewApp {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
                 {/* 修改作品  */}
                 <Route path="/courses/:coursesId/graduation_tasks/:category_id/:work_Id/works/edit"
                        render={
-                           (props) => (<GraduationTasksSubmiteditApp {...this.props} {...props} {...this.state} />)
+                           (props) => (<GraduationTasksSubmiteditApp {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
@@ -567,20 +576,20 @@ class CoursesIndex extends Component{
 
                 <Route path="/courses/:coursesId/graduation_tasks/:category_id/:task_Id/setting"
                        render={
-                           (props) => (<GraduationTaskssetting {...this.props} {...props} {...this.state} />)
+                           (props) => (<GraduationTaskssetting {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
 
                 <Route path="/courses/:coursesId/graduation_tasks/:category_id/:task_Id/questions"
                        render={
-                           (props) => (<GraduationTasksquestions {...this.props} {...props} {...this.state} />)
+                           (props) => (<GraduationTasksquestions {...this.props} {...props} {...this.state} {...common}/>)
                        }></Route>
 
 
                 <Route path="/courses/:coursesId/graduation_tasks/:category_id/:task_Id/list"
                        render={
-                           (props) => (<GraduationTaskssettinglist {...this.props} {...props} {...this.state} />)
+                           (props) => (<GraduationTaskssettinglist {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
@@ -589,7 +598,7 @@ class CoursesIndex extends Component{
                 {/* 修改毕设任务 https://www.trustie.net/issues/19981 */}
                 <Route path="/courses/:coursesId/graduation_tasks/:category_id/edit"
                        render={
-                           (props) => (<GraduationTaskseditApp {...this.props} {...props} {...this.state} />)
+                           (props) => (<GraduationTaskseditApp {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
@@ -597,7 +606,7 @@ class CoursesIndex extends Component{
                 {/* 新建毕设任务 https://www.trustie.net/issues/19981 */}
                 <Route path="/courses/:coursesId/graduation_tasks/:category_id/new"
                        render={
-                           (props) => (<GraduationTasksnewApp {...this.props} {...props} {...this.state} />)
+                           (props) => (<GraduationTasksnewApp {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
@@ -605,87 +614,87 @@ class CoursesIndex extends Component{
                 {/* 毕设任务列表 https://www.trustie.net/issues/19981 */}
                 <Route path="/courses/:coursesId/graduation_tasks/:Id" exact
                        render={
-                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} />)
+                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
                 {/*/!* 毕业设计主 https://www.trustie.net/issues/19981 *!/*/}
                 {/*<Route path="/courses/:coursesId/graduation"*/}
                        {/*render={*/}
-                           {/*(props) => (<GraduationTopics {...this.props} {...props} {...this.state} />)*/}
+                           {/*(props) => (<GraduationTopics {...this.props} {...props} {...this.state} {...common}/>)*/}
                        {/*}*/}
                 {/*></Route>*/}
 
                 {/*/!* 资源子目录 https://www.trustie.net/issues/19917 *!/*/}
                 {/*<Route path="/courses/:coursesId/attachment/attachment/:attachmentId"*/}
                 {/*render={*/}
-                {/*(props) => (<Files {...this.props} {...props} {...this.state} />)*/}
+                {/*(props) => (<Files {...this.props} {...props} {...this.state} {...common}/>)*/}
                 {/*}*/}
                 {/*></Route>*/}
                 {/* 教师列表*/}
                 <Route path="/courses/:coursesId/teachers"
                        render={
-                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} />)
+                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
                 {/* 学生列表*/}
                 <Route path="/courses/:coursesId/students"
                        render={
-                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} />)
+                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
                 {/* 分班列表 */}
                 <Route path="/courses/:coursesId/course_groups/:course_group_id"
                        render={
-                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} />)
+                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
                 
                 {/* 普通作业 */}
                 <Route path="/courses/:coursesId/common_homeworks/:category_id" exact 
                 render={
-                    (props) => (<ListPageIndex {...this.props} {...props} {...this.state} />)
+                    (props) => (<ListPageIndex {...this.props} {...props} {...this.state} {...common}/>)
                 }
                 ></Route>
                 {/* 分组作业 */}
                 <Route path="/courses/:coursesId/group_homeworks/:category_id" exact 
                        render={
-                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} />)
+                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
                 {/* 普通作业 */}
                 <Route path="/courses/:coursesId/common_homeworks/" strict
                        render={
-                           (props) => (<CommonWork {...this.props} {...props} {...this.state} />)
+                           (props) => (<CommonWork {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
                 {/* 分组作业 */}
                 <Route path="/courses/:coursesId/group_homeworks/" strict
                        render={
-                           (props) => (<GroupWork {...this.props} {...props} {...this.state} />)
+                           (props) => (<GroupWork {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
                 {/* 问卷答题 */}
                 <Route path="/courses/:coursesId/polls/:pollId/users/:login"
                        render={
-                           (props) => (<PollInfo {...this.props} {...props} {...this.state} />)
+                           (props) => (<PollInfo {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
                 {/* 问卷详情  */}
                 <Route path="/courses/:coursesId/polls/:pollId/detail"
                        render={
-                           (props) => (<PollDetail {...this.props} {...props} {...this.state} />)
+                           (props) => (<PollDetail {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
                 {/* 问卷新建 */}
                 <Route path="/courses/:coursesId/polls/:pollid/:news"
                        render={
-                           (props) => (<PollNew {...this.props} {...props} {...this.state} />)
+                           (props) => (<PollNew {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
                 {/*/!* 问卷编辑 *!/*/}
@@ -697,7 +706,7 @@ class CoursesIndex extends Component{
                 {/* 问卷  */}
                 <Route path="/courses/:coursesId/polls/:Id"
                        render={
-                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} />)
+                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
@@ -705,20 +714,20 @@ class CoursesIndex extends Component{
                 {/* 试卷查看/评阅 */}
                 <Route exact path="/courses/:coursesId/exercises/:Id/users/:userId"
                     render={
-                    (props)=>(<ExerciseReviewAndAnswer {...this.props} {...props} {...this.state} />)
+                    (props)=>(<ExerciseReviewAndAnswer {...this.props} {...props} {...this.state} {...common}/>)
                     }
                 ></Route>
 
                 {/*试卷新建  */}
                 <Route exact path="/courses/:coursesId/exercises/new"
                     render={
-                    (props) => (<ExerciseNew {...this.props} {...props} {...this.state} />)
+                    (props) => (<ExerciseNew {...this.props} {...props} {...this.state} {...common}/>)
                     }
                 ></Route>
                 {/*试卷新建  */}
                 <Route exact path="/courses/:coursesId/exercises/:Id/edit"
                     render={
-                    (props) => (<ExerciseNew {...this.props} {...props} {...this.state} />)
+                    (props) => (<ExerciseNew {...this.props} {...props} {...this.state} {...common}/>)
                     }
                 ></Route>
 
@@ -726,7 +735,7 @@ class CoursesIndex extends Component{
 
                 <Route path="/courses/:coursesId/exercises/:Id/student_exercise_list"
                        render={
-                           (props) => (<Testpapersettinghomepage {...this.props} {...props} {...this.state} />)
+                           (props) => (<Testpapersettinghomepage {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
@@ -735,14 +744,14 @@ class CoursesIndex extends Component{
                 <Route
                     path="/courses/:coursesId/exercises/:Id/Studentshavecompletedthelist"
                     render={
-                        (props) => (<Studentshavecompletedthelist {...this.props} {...props} {...this.state} />)
+                        (props) => (<Studentshavecompletedthelist {...this.props} {...props} {...this.state} {...common}/>)
                     }
                 >
                 </Route>
                 {/* 试卷  */}
                 <Route path="/courses/:coursesId/exercises/:Id"
                        render={
-                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} />)
+                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
@@ -750,65 +759,65 @@ class CoursesIndex extends Component{
                 {/*实训查重详情*/}
                 <Route path="/courses/:coursesId/shixun_homeworks/:homeworkid/review_detail/:userid"
                        render={
-                           (props) => (<ShixunWorkDetails {...this.props} {...props}  {...this.state} />)
+                           (props) => (<ShixunWorkDetails {...this.props} {...props}  {...this.state} {...common}/>)
                        }
                 ></Route>
               <Route path="/courses/:coursesId/shixun_homework/:homeworkid/review_detail/:userid"
                      render={
-                       (props) => (<ShixunWorkDetails {...this.props} {...props}  {...this.state} />)
+                       (props) => (<ShixunWorkDetails {...this.props} {...props}  {...this.state} {...common}/>)
                      }
               ></Route>
 
                 {/*实训查重列表*/}
                 <Route path="/courses/:coursesId/shixun_homeworks/:homeworkid/student_work"
                        render={
-                           (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} />)
+                           (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} {...common}/>)
                        }
                 ></Route>
               <Route path="/courses/:coursesId/shixun_homework/:homeworkid/student_work"
                      render={
-                       (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} />)
+                       (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} {...common}/>)
                      }
               ></Route>
 
                 {/*实训报告*/}
                 <Route path="/courses/:coursesId/shixun_homeworks/:homeworkid/shixun_work_report"
                        render={
-                           (props) => (<ShixunWorkReport {...this.props} {...props}  {...this.state} />)
+                           (props) => (<ShixunWorkReport {...this.props} {...props}  {...this.state} {...common}/>)
                        }
                 ></Route>
               <Route path="/courses/:coursesId/shixun_homework/:homeworkid/shixun_work_report"
                      render={
-                       (props) => (<ShixunWorkReport {...this.props} {...props}  {...this.state} />)
+                       (props) => (<ShixunWorkReport {...this.props} {...props}  {...this.state} {...common}/>)
                      }
               ></Route>
 
                 {/*教师列表*/}
                 <Route path="/courses/:coursesId/shixun_homeworks/:homeworkid/list"
                        render={
-                           (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} />)
+                           (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} {...common}/>)
                        }
                 ></Route>
               <Route path="/courses/:coursesId/shixun_homework/:homeworkid/list"
                      render={
-                       (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} />)
+                       (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} {...common}/>)
                      }
               ></Route>
                {/*实训作业page*/}
               <Route path="/courses/:coursesId/shixun_homeworks/:homeworkid/Page"
                      render={
-                       (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} />)
+                       (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} {...common}/>)
                      }
               ></Route>
                 {/*实训作业设置*/}
                 <Route path="/courses/:coursesId/shixun_homeworks/:homeworkid/settings"
                        render={
-                           (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} />)
+                           (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} {...common}/>)
                        }
                 ></Route>
               <Route path="/courses/:coursesId/shixun_homework/:homeworkid/settings"
                      render={
-                       (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} />)
+                       (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} {...common}/>)
                      }
               ></Route>
                 {/*/!*实训作品列表教师*!/*/}
@@ -847,21 +856,21 @@ class CoursesIndex extends Component{
               {/*实训作业问答主目录*/}
                 <Route path="/courses/:coursesId/shixun_homeworks/:homeworkid/questions"
                        render={
-                           (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} />)
+                           (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} {...common}/>)
                        }
                 ></Route>
 
               {/*实训作业问答子目录*/}
               <Route path="/courses/:coursesId/shixun_homework/:homeworkid/questions"
                      render={
-                       (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} />)
+                       (props) => (<ShixunHomeworkPage {...this.props} {...props}  {...this.state} {...common}/>)
                      }
               ></Route>
 
                 {/*新建课堂*/}
                 <Route path="/courses/new"
                        render={
-                           (props) => (<WrappedCoursesNewApp {...this.props} {...props} {...this.state} />)
+                           (props) => (<WrappedCoursesNewApp {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
               {/*新建精品课堂*/}
@@ -869,47 +878,47 @@ class CoursesIndex extends Component{
               {/*id 是否是私有或者公有*/}
               <Route path="/courses/news/:subjectid/newgold/:id"
                      render={
-                       (props) => (<WrappedCoursesNewAppGoldclass {...this.props} {...props} {...this.state} />)
+                       (props) => (<WrappedCoursesNewAppGoldclass {...this.props} {...props} {...this.state} {...common}/>)
                      }
               ></Route>
               {/*修改精品课堂*/}
               <Route path="/courses/:coursesId/newgolds/settings"
                      render={
-                       (props) => (<WrappedCoursesNewAppGoldclass {...this.props} {...props} {...this.state} />)
+                       (props) => (<WrappedCoursesNewAppGoldclass {...this.props} {...props} {...this.state} {...common}/>)
                      }
               ></Route>
                 {/*修改课堂*/}
                 <Route path="/courses/:coursesId/settings"
                        render={
-                           (props) => (<WrappedCoursesNewApp {...this.props} {...props} {...this.state} />)
+                           (props) => (<WrappedCoursesNewApp {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
                 {/* 实训作业子页面*/}
                 <Route path="/courses/:coursesId/shixun_homework/:category_id"
                        render={
-                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} />)
+                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
                 {/* 实训作业页面*/}
                 <Route path="/courses/:coursesId/shixun_homeworks/:main_id"
                        render={
-                         (props) => (<ListPageIndex {...this.props} {...props} {...this.state} />)
+                         (props) => (<ListPageIndex {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
 
                 {/*/!*实训作业and课堂详情页*!/*/}
                 <Route path="/courses/:coursesId"
                         render={
-                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} />)
+                           (props) => (<ListPageIndex {...this.props} {...props} {...this.state} {...common}/>)
                         }
                 ></Route>
 
                 {/*课堂首页*/}
                 <Route path="/courses"
                        render={
-                           (props) => (<CoursesHome {...this.props} {...props} {...this.state} />)
+                           (props) => (<CoursesHome {...this.props} {...props} {...this.state} {...common}/>)
                        }
                 ></Route>
                 {/*<Route exact path="/courses" component={CoursesHome}  {...this.props}  {...props}  {...this.state} ></Route>*/}
@@ -919,4 +928,4 @@ class CoursesIndex extends Component{
     }
 }
 
-export default ImageLayerOfCommentHOC({imgSelector: '.imageLayerParent img, .imageLayerParent .imageTarget', parentSelector: '.newMain'}) (CNotificationHOC() ( SnackbarHOC() ( TPMIndexHOC(CoursesIndex) )));
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+export default withRouter(ImageLayerOfCommentHOC({imgSelector: '.imageLayerParent img, .imageLayerParent .imageTarget', parentSelector: '.newMain'}) (CNotificationHOC() ( SnackbarHOC() ( TPMIndexHOC(CoursesIndex) ))));
\ No newline at end of file