增加查询内容保存；

src/views/PlatformData/UserLoginStats.vue

@@ -241,6 +241,19 @@ const chartRegionPieRef = ref(null);
 const chartRegionMemberPieRef = ref(null);
 const chartRegionNonMemberPieRef = ref(null);
 
+// 初始化查询参数
+const initQueryParams = () => {
+    const { start_time, end_time, region } = route.query;
+    if (start_time && end_time) {
+        dateRange.value = [new Date(start_time), new Date(end_time)];
+    }
+    if (region) {
+        selectedRegion.value = region;
+    }
+};
+
+initQueryParams();
+
 // 响应式数据：登录数据统计
 const loginStats = ref({
   total: 0,
@@ -360,6 +373,25 @@ const updateTrendChart = (list) => {
 };
 
 const handleSearch = () => {
+    // 更新 URL 参数
+    const query = { ...route.query };
+    
+    if (dateRange.value && dateRange.value.length === 2) {
+        query.start_time = formatDate(dateRange.value[0]);
+        query.end_time = formatDate(dateRange.value[1]);
+    } else {
+        delete query.start_time;
+        delete query.end_time;
+    }
+
+    if (selectedRegion.value && selectedRegion.value !== 'all') {
+        query.region = selectedRegion.value;
+    } else {
+        delete query.region;
+    }
+
+    router.replace({ query });
+
     fetchTrendData();
     // 这里也可以加上 fetchLoginData() 如果登录统计也支持搜索参数
 };
@@ -367,6 +399,14 @@ const handleSearch = () => {
 const handleReset = () => {
     dateRange.value = '';
     selectedRegion.value = '';
+    
+    // 清除 URL 参数
+    const query = { ...route.query };
+    delete query.start_time;
+    delete query.end_time;
+    delete query.region;
+    router.replace({ query });
+
     fetchTrendData();
 };