diff --git a/src/App.vue b/src/App.vue
index 555611c..dd4c6d7 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -5,9 +5,10 @@
 </template>
 
 <script>
+import Util from '@/util'
 export default {
   name: "App",
-  created() {
+  created () {
     //在页面加载时读取sessionStorage里的状态信息
     if (sessionStorage.getItem("store")) {
       this.$store.replaceState(
@@ -17,10 +18,26 @@ export default {
           JSON.parse(sessionStorage.getItem("store"))
         )
       );
-    } //在页面刷新时将vuex里的信息保存到sessionStorage里
+    }
+    //在页面刷新时将vuex里的信息保存到sessionStorage里
     window.addEventListener("beforeunload", () => {
+      console.log('beforeunload')
+
+      const opened = +localStorage.getItem('opened')
+      if (opened) {
+        localStorage.setItem('opened', opened - 1)
+      } else {
+        localStorage.removeItem('opened')
+      }
+
       sessionStorage.setItem("store", JSON.stringify(this.$store.state));
     });
+
+    // 保证同一个浏览器只有一个当前系统能打开
+    if (!document.referrer) {
+      localStorage.setItem('opened', 2)
+      Util.exit()
+    }
   }
 };
 </script>
@@ -32,9 +49,8 @@ export default {
   -moz-osx-font-smoothing: grayscale;
   color: #2c3e50;
 }
+
 body {
   margin: 0;
 }
 </style>
-
-
diff --git a/src/components/TestPanel.vue b/src/components/TestPanel.vue
index 0f62c3f..7e0d39b 100644
--- a/src/components/TestPanel.vue
+++ b/src/components/TestPanel.vue
@@ -164,7 +164,7 @@
 <script>
 import newmain from "../util/newMain";
 import quill from "@/components/quill";
-import util from '@/util'
+import Util from '@/util'
 import Config from '@/config'
 import Cookie from 'js-cookie'
 import 'quill/dist/quill.core.css';
@@ -824,7 +824,7 @@ export default {
       const date = await this.getNow()
       const { entryTime } = this
       const timeSum = Math.ceil((date - entryTime) / 60000) // 计算实验用时（分钟），向上取整
-      const submitTime = util.formatDate('yyyy-MM-dd hh:mm:ss', date)
+      const submitTime = Util.formatDate('yyyy-MM-dd hh:mm:ss', date)
       const projectId = this.projectId
       const pro = this.projectList.find(e => e.projectId == projectId)
       const projectName = pro ? pro.projectName : '' // 获取项目名称
@@ -847,7 +847,7 @@ export default {
         classId: this.classId ? this.classId : '',
         className: this.className ? this.className : '',
         curriculumId: this.courseId,
-        startTime: util.formatDate('yyyy-MM-dd hh:mm:ss', entryTime), // 取页面进入的时间
+        startTime: Util.formatDate('yyyy-MM-dd hh:mm:ss', entryTime), // 取页面进入的时间
         endTime: this.projectPermissions ? this.endTime : submitTime, // 结束时间（考核：直接从职站取考核的结束时间；练习：取提交时间）
         submitTime, // 提交时间，即当前时间（这3个时间都是传完整的日期时间格式）
         timeSum,
@@ -881,7 +881,7 @@ export default {
           }
           score += e.examScore // 计算总分
         })
-        this.grade = util.handleZero(score) // 前置加0(竞赛不显示分数)
+        this.grade = Util.handleZero(score) // 前置加0(竞赛不显示分数)
         this.reportId = reportId
         this.$store.commit('setReportId', reportId)
         this.$store.commit('setTaskList', taskList)
diff --git a/src/util/index.js b/src/util/index.js
index 6e46fee..876e59b 100644
--- a/src/util/index.js
+++ b/src/util/index.js
@@ -1,118 +1,124 @@
+import Config from '@/config'
+import Cookie from 'js-cookie'
+
 export default {
-    getCookie(cookie_name) {
-        //获取cookie中指定key的value
-        var allcookies = document.cookie; //索引长度，开始索引的位置
-        var cookie_pos = allcookies.indexOf(cookie_name); // 如果找到了索引，就代表cookie存在,否则不存在
-  
-        if (cookie_pos != -1) {
-            // 把cookie_pos放在值的开始，只要给值加1即可
-            //计算取cookie值得开始索引，加的1为“=”
-            cookie_pos = cookie_pos + cookie_name.length + 1; //计算取cookie值得结束索引
-            var cookie_end = allcookies.indexOf(";", cookie_pos);
-    
-            if (cookie_end == -1) {
-                cookie_end = allcookies.length;
-            } //得到想要的cookie的值
-            var value = unescape(allcookies.substring(cookie_pos, cookie_end));
-        }
-        return value;
-    },
-    // 返回格式化时间，传参例如："yyyy-MM-dd hh:mm:ss"
-    formatDate(fmt,date) {
-        var date = date ? date : new Date()
-        var o = { 
-            "M+" : date.getMonth()+1,                 //月份 
-            "d+" : date.getDate(),                    //日 
-            "h+" : date.getHours(),                   //小时 
-            "m+" : date.getMinutes(),                 //分 
-            "s+" : date.getSeconds(),                 //秒 
-            "q+" : Math.floor((date.getMonth()+3)/3), //季度 
-            "S"  : date.getMilliseconds()             //毫秒 
-        }; 
-        if(/(y+)/.test(fmt)) {
-            fmt=fmt.replace(RegExp.$1, (date.getFullYear()+"").substr(4 - RegExp.$1.length)); 
-        }
-        for(var k in o) {
-            if(new RegExp("("+ k +")").test(fmt)){
-                fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));
-            }
-        }
-        return fmt
-    },
-    // 传入文件后缀判断是否是视频
-    isVideo(ext) {
-        if ("mp4,3gp,mov,m4v,avi,dat,mkv,flv,vob,rmvb,rm,qlv".includes(ext)) return true;
-        return false;
-    },
-    // 传入文件后缀判断是否是图片
-    isImg(ext) {
-        if ("jpg,jpeg,png,gif,svg,psd".includes(ext)) return true;
-        return false;
-    },
-    // 传入文件后缀判断是否是pdf以外的文档
-    isDoc(ext) {
-      if ("xls,xlsx,doc,docx,pdf,ppt,pptx".includes(ext)) return true;
-        return false;
-    },
-		// 传入文件名获取文件后缀
-		getFileExt(fileName) {
-			return fileName.substring(fileName.lastIndexOf('.') + 1)
-		},
-    // 下载文件
-    downloadFile(fileName,url) {
-        var x = new XMLHttpRequest()
-        x.open("GET", url, true)
-        x.responseType = 'blob'
-        x.onload=function(e) {
-            var url = window.URL.createObjectURL(x.response)
-            var a = document.createElement('a')
-            a.href = url
-            a.download = fileName
-            a.click()
-        }
-        x.send()
-    },
-    // 下载图片
-    downloadPic(fileName, src) {
-			const canvas = document.createElement('canvas')
-			const img = document.createElement('img')
-			// 解决跨域 Canvas 污染问题
-			img.setAttribute('crossOrigin', 'anonymous')
-			//将资源链接赋值过去，才能触发img.onload事件
-			img.src = src
-			img.onload = function (e) {
-				canvas.width = img.width
-				canvas.height = img.height
-				const context = canvas.getContext('2d')
-				//绘制图片
-				context.drawImage(img, 0, 0, img.width, img.height)
-				canvas.getContext('2d').drawImage(img, 0, 0, img.width, img.height)
-				//将canvas转base64码，然后创建一个a连接自动下载图片
-				canvas.toBlob((blob) => {
-					const link = document.createElement('a')
-					link.href = window.URL.createObjectURL(blob)
-					link.download = fileName
-					link.click()
-				})
-			}
-    },
-    // 传入文件名和数据，下载文件
-    downloadFileDirect(fileName,data) {
-        if ('download' in document.createElement('a')) { // 非IE下载
-            const elink = document.createElement('a')
-            elink.download = fileName
-            elink.style.display = 'none'
-            elink.href = URL.createObjectURL(data)
-            document.body.appendChild(elink)
-            elink.click()
-            URL.revokeObjectURL(elink.href) // 释放URL 对象
-            document.body.removeChild(elink)
-        } else { // IE10+下载
-            navigator.msSaveBlob(data, fileName)
-        }
-    },
-    // 小于0前面加上0
-    handleZero (num) {
-        return num < 10 ? '0' + num : num
+  // 返回格式化时间，传参例如："yyyy-MM-dd hh:mm:ss"
+  formatDate (fmt, date) {
+    var date = date ? date : new Date()
+    var o = {
+      "M+": date.getMonth() + 1,                 //月份 
+      "d+": date.getDate(),                    //日 
+      "h+": date.getHours(),                   //小时 
+      "m+": date.getMinutes(),                 //分 
+      "s+": date.getSeconds(),                 //秒 
+      "q+": Math.floor((date.getMonth() + 3) / 3), //季度 
+      "S": date.getMilliseconds()             //毫秒 
+    };
+    if (/(y+)/.test(fmt)) {
+      fmt = fmt.replace(RegExp.$1, (date.getFullYear() + "").substr(4 - RegExp.$1.length));
     }
+    for (var k in o) {
+      if (new RegExp("(" + k + ")").test(fmt)) {
+        fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
+      }
+    }
+    return fmt
+  },
+  // 传入文件后缀判断是否是视频
+  isVideo (ext) {
+    if ("mp4,3gp,mov,m4v,avi,dat,mkv,flv,vob,rmvb,rm,qlv".includes(ext)) return true;
+    return false;
+  },
+  // 传入文件后缀判断是否是图片
+  isImg (ext) {
+    if ("jpg,jpeg,png,gif,svg,psd".includes(ext)) return true;
+    return false;
+  },
+  // 传入文件后缀判断是否是pdf以外的文档
+  isDoc (ext) {
+    if ("xls,xlsx,doc,docx,pdf,ppt,pptx".includes(ext)) return true;
+    return false;
+  },
+  // 传入文件名获取文件后缀
+  getFileExt (fileName) {
+    return fileName.substring(fileName.lastIndexOf('.') + 1)
+  },
+  // 下载文件
+  downloadFile (fileName, url) {
+    var x = new XMLHttpRequest()
+    x.open("GET", url, true)
+    x.responseType = 'blob'
+    x.onload = function (e) {
+      var url = window.URL.createObjectURL(x.response)
+      var a = document.createElement('a')
+      a.href = url
+      a.download = fileName
+      a.click()
+    }
+    x.send()
+  },
+  // 下载图片
+  downloadPic (fileName, src) {
+    const canvas = document.createElement('canvas')
+    const img = document.createElement('img')
+    // 解决跨域 Canvas 污染问题
+    img.setAttribute('crossOrigin', 'anonymous')
+    //将资源链接赋值过去，才能触发img.onload事件
+    img.src = src
+    img.onload = function (e) {
+      canvas.width = img.width
+      canvas.height = img.height
+      const context = canvas.getContext('2d')
+      //绘制图片
+      context.drawImage(img, 0, 0, img.width, img.height)
+      canvas.getContext('2d').drawImage(img, 0, 0, img.width, img.height)
+      //将canvas转base64码，然后创建一个a连接自动下载图片
+      canvas.toBlob((blob) => {
+        const link = document.createElement('a')
+        link.href = window.URL.createObjectURL(blob)
+        link.download = fileName
+        link.click()
+      })
+    }
+  },
+  // 传入文件名和数据，下载文件
+  downloadFileDirect (fileName, data) {
+    if ('download' in document.createElement('a')) { // 非IE下载
+      const elink = document.createElement('a')
+      elink.download = fileName
+      elink.style.display = 'none'
+      elink.href = URL.createObjectURL(data)
+      document.body.appendChild(elink)
+      elink.click()
+      URL.revokeObjectURL(elink.href) // 释放URL 对象
+      document.body.removeChild(elink)
+    } else { // IE10+下载
+      navigator.msSaveBlob(data, fileName)
+    }
+  },
+  // 小于0前面加上0
+  handleZero (num) {
+    return num < 10 ? '0' + num : num
+  },
+  // 退出实验
+  exit () {
+    let href = Config.isDev ?
+      `http://${location.hostname}:8082/#/` :
+      `${location.origin}${Cookie.get('admin-fromManager') ?
+        '/admin' :
+        (!Config.isTest) ?
+          '' :
+          '/student'}/#/`
+    // 考核
+    if (Cookie.get('admin-assessmentId')) {
+      href += `ass/list`
+    } else if (Cookie.get('admin-competitionId')) {
+      // 竞赛
+      href += `match/list`
+    } else {
+      // 练习
+      href += `station/preview?courseId=${Cookie.get('admin-courseId')}&curriculumName=${Cookie.get('admin-curriculumName') ? decodeURIComponent(Cookie.get('admin-curriculumName')) : 'python'}&mallId=${Cookie.get('admin-mallId')}`
+    }
+    location.href = href
+  }
 }
\ No newline at end of file
diff --git a/src/views/Home.vue b/src/views/Home.vue
index 005296c..3637720 100644
--- a/src/views/Home.vue
+++ b/src/views/Home.vue
@@ -50,9 +50,10 @@
 </template>
 
 <script>
-import newmain from "../util/newMain";
-import testPanel from "../components/TestPanel";
-import codemirror from "../components/codemirror";
+import newmain from "../util/newMain"
+import Util from '@/util'
+import testPanel from "../components/TestPanel"
+import codemirror from "../components/codemirror"
 import Cookie from 'js-cookie'
 import { Loading } from 'element-ui'
 import Config from '@/config'
@@ -95,16 +96,19 @@ export default {
     testPanel
   },
   mounted () {
-    // 保证同一个浏览器只有一个当前系统能打开
-    if (!document.referrer) {
+    const opened = +localStorage.getItem('opened')
+    if (opened) {
+      localStorage.setItem('opened', opened + 1)
       this.notAllowed = 1
       this.$alert('我们注意到您当前已尝试打开多个实验页面。为保证实验的公平性和诚信，系统仅允许单个实验页面处于活跃状态。', '提示', {
         confirmButtonText: '退出当前页面',
         showClose: false,
-        callback: action => {
-          this.back()
-        }
+        beforeClose: () => {
+          Util.exit()
+        },
       })
+    } else {
+      localStorage.setItem('opened', 1)
     }
 
     document.onkeydown = function (event) {
@@ -158,7 +162,7 @@ export default {
         if ((new Date().getTime() - lastTime) > this.$config.autoLogoutTime) {
           logout || this.$message.error('用户登录过期，请重新登录')
           logout = true
-          setTimeout(this.back, 1500)
+          setTimeout(Util.exit, 1500)
         }
       }, 1000)
     },
@@ -177,24 +181,7 @@ export default {
     },
     // 退出实验
     back () {
-      let href = this.$config.isDev ?
-        `http://${location.hostname}:8082/#/` :
-        `${location.origin}${this.fromManager ?
-          '/admin' :
-          (!this.$config.isTest) ?
-            '' :
-            '/student'}/#/`
-      // 考核
-      if (this.assessmentId) {
-        href += `ass/list`
-      } else if (this.competitionId) {
-        // 竞赛
-        href += `match/list`
-      } else {
-        // 练习
-        href += `station/preview?courseId=${this.courseId}&curriculumName=${this.curriculumName}&mallId=${this.mallId}`
-      }
-      location.href = href
+      Util.exit()
     },
     // 赋值项目id、项目列表
     setPoints (projectId, systemId, workbench) {