improvement: 已做题数计算修改

src/pages/index/index.vue

@@ -147,13 +147,15 @@ export default {
       ]
     },
     finishCount() {
-      this.questionList[this.questionWarehouseId].reduce(
-        (accumulator, currentValue) => {
-          if (currentValue.submitStatus) accumulator++
-          return accumulator
-        },
-        0
-      )
+      return this.questionList[this.questionWarehouseId]
+        ? this.questionList[this.questionWarehouseId].reduce(
+            (accumulator, currentValue) => {
+              if (currentValue.submitStatus) accumulator++
+              return accumulator
+            },
+            0
+          )
+        : 0
     },
     examText() {
       return this.info.cardId ? '/' + this.info.totalExam : '题库进阶练习'