fix: 修改倒计时时间错误的问题，缓存试卷时间修改为5-10秒之间随机提交

src/views/Exam.vue

@@ -45,7 +45,7 @@
 import * as api from '@/api/base.js'
 import QuestionList from '@/components/QuestionList.vue'
 import QuestionNum from '@/components/QuestionNum.vue'
-import { merge } from 'lodash-es'
+import { merge, random } from 'lodash-es'
 
 export default {
   components: { QuestionList, QuestionNum },
@@ -230,10 +230,12 @@ export default {
     },
     // 自动缓存试卷
     setCacheExamTimer() {
-      // 10 秒缓存一次试卷
+      // 5-10 秒缓存一次试卷
+      const interval = random(5000, 10000)
+      console.log(interval)
       this.cacheExamTimer = setInterval(() => {
         this.postCacheExam()
-      }, 5000)
+      }, interval)
     },
     // 倒计时
     setCountdownTimer() {
@@ -246,7 +248,7 @@ export default {
           this.examTime = '00:00:00 倒计时'
         } else {
           const leftTime = parseInt(countTime / 1000)
-          const h = parseInt((leftTime / (60 * 60)) % 24)
+          const h = parseInt((leftTime / (60 * 60)))
             .toString()
             .padStart(2, '0')
           const m = parseInt((leftTime / 60) % 60)