feat(views): 环境监控”时间轴滚动查询“功能优化值为null的处理逻辑

src/views/env-monitor/EnvMonitor.vue

@@ -554,6 +554,7 @@ const generateTimeArray = async () => {
 
 // 时间字符串转分钟数（支持带日期和不带日期）
 function parseTimeToMinutes(timeStr: string): number {
+  if (timeStr === null) return 24 * 60; // null视为次日0点
   if (!timeStr.trim()) return 24 * 60; // 空字符串视为次日0点
   const timePart = timeStr.includes(' ') ? timeStr.split(' ')[1] : timeStr;
   const [hours, minutes] = timePart.split(':').slice(0, 2).map(Number);
@@ -578,13 +579,18 @@ const getAlarmHistoryList = () => {
             const isOverlap = triggerStart < aEnd && recoverEnd >= aStart;
 
             // 特殊处理：当recoverTime为空时，触发时间后的所有区间
-            const isInfiniteMode = !bItem.recoverTime.trim() && aStart >= triggerStart;
+            const recoverTimeString = bItem.recoverTime === null ? '' : bItem.recoverTime;
+            const isInfiniteMode = !recoverTimeString.trim() && aStart >= triggerStart;
 
             if (isOverlap || isInfiniteMode) {
               aItem.backgroundShow = true;
             }
           }
         }
+      } else {
+        for (const aItem of timeList.value) {
+          aItem.backgroundShow = false;
+        }
       }
     }
   });