拜访任务页面优化（清空历史数据）

src/views/historicalVisit/historicalDetails.vue

@@ -262,6 +262,7 @@ export default {
   //   }
   // },
   activated() {
+    this.list = null;
     this.toastLoading(0, '加载中...', true);
     this.visitsId = this.$route.query.visitId;
     this.dataform.visitsId = this.$route.query.visitId;