update

controller/statisticsController.js

@@ -139,9 +139,9 @@ async function getWSChangeTrend(req, res, next) {
             {
                 $group: {
                     _id: { $dateToString: { format: "%Y-%m-%d", date: "$time" } }, // 将时间戳转换为日期字符串
-                    wsTemperature: { $avg: "$wsTemperature" },
-                    wsMoisture: { $avg: "$wsMoisture" },
-                    rainfall: { $avg: "$rainfall" },
+                    wsTemperature: {$round: [{ $avg: "$wsTemperature" }, 2]},
+                    wsMoisture: {$round: [{ $avg: "$wsMoisture" }, 2]},
+                    rainfall: {$round: [{ $avg: "$rainfall" }, 2]},
                 }
             },
             { $sort: { _id: 1 } }