bug fix

src/features/examwork/StudentManagement/StudentTrackRecord.vue

@@ -77,7 +77,7 @@
                   <p v-if="log.durationTime">
                     持续时长约：{{ log.durationTime }}
                   </p>
-                  <p :class="{ 'color-danger': log.ipChange }">
+                  <p v-if="log.ip" :class="{ 'color-danger': log.ipChange }">
                     ip：{{ log.ip }}，属地：{{ log.province }}{{ log.city }}
                   </p>
                 </div>

src/features/invigilation/OnlinePatrol/PatrolWarningDetail.vue

@@ -168,7 +168,7 @@
                   <p v-if="log.durationTime">
                     持续时长约：{{ log.durationTime }}
                   </p>
-                  <p :class="{ 'color-danger': log.ipChange }">
+                  <p v-if="log.ip" :class="{ 'color-danger': log.ipChange }">
                     ip：{{ log.ip }}，属地：{{ log.province }}{{ log.city }}
                   </p>
                 </div>

src/features/invigilation/RealtimeMonitoring/WarningDetail.vue

@@ -253,7 +253,7 @@
                   <p v-if="log.durationTime">
                     持续时长约：{{ log.durationTime }}
                   </p>
-                  <p :class="{ 'color-danger': log.ipChange }">
+                  <p v-if="log.ip" :class="{ 'color-danger': log.ipChange }">
                     ip：{{ log.ip }}，属地：{{ log.province }}{{ log.city }}
                   </p>
                 </div>