✨ feat: 可视化大屏完善

gear-ui3/src/views/dashboard/components/SalesMetricsCard.vue

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+<template>
+  <div class="metrics-card">
+    <div class="metrics-grid">
+      <!-- 总客户数 -->
+      <div class="metric-item">
+        <div class="metric-value">{{ totalCustomers }}</div>
+        <div class="metric-label">总客户数</div>
+        <div class="metric-trend" :class="customerTrendClass">
+          <el-icon :size="14"><ArrowUp /></el-icon> {{ customerTrend }}%
+        </div>
+      </div>
+      <!-- 总订单数 -->
+      <div class="metric-item">
+        <div class="metric-value">{{ totalOrders }}</div>
+        <div class="metric-label">总订单数</div>
+        <div class="metric-trend" :class="orderTrendClass">
+          <el-icon :size="14"><ArrowUp /></el-icon> {{ orderTrend }}%
+        </div>
+      </div>
+      <!-- 总销售额 -->
+      <div class="metric-item">
+        <div class="metric-value">¥{{ totalSales.toFixed(2) }}</div>
+        <div class="metric-label">总销售额</div>
+        <div class="metric-trend" :class="salesTrendClass">
+          <el-icon :size="14"><ArrowUp /></el-icon> {{ salesTrend }}%
+        </div>
+      </div>
+      <!-- 退换货率 -->
+      <div class="metric-item">
+        <div class="metric-value">{{ returnRate.toFixed(2) }}%</div>
+        <div class="metric-label">退换货率</div>
+        <div class="metric-trend" :class="returnRateTrendClass">
+          <el-icon :size="14"><ArrowDown /></el-icon> {{ returnRateTrend }}%
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { computed } from 'vue';
+import { ArrowUp, ArrowDown } from '@element-plus/icons-vue';
+
+const props = defineProps({
+  customers: { type: Array, default: () => [] },
+  orders: { type: Array, default: () => [] },
+  returnExchanges: { type: Array, default: () => [] },
+  // 趋势数据（模拟，可从接口扩展）
+  customerTrend: { type: Number, default: 5.2 },
+  orderTrend: { type: Number, default: 8.7 },
+  salesTrend: { type: Number, default: 12.3 },
+  returnRateTrend: { type: Number, default: -2.1 }
+});
+
+// 计算核心指标
+const totalCustomers = computed(() => props.customers.length);
+const totalOrders = computed(() => props.orders.length);
+const totalSales = computed(() => {
+  return props.orders.reduce((sum, order) => sum + Number(order.taxAmount || 0), 0);
+});
+const returnRate = computed(() => {
+  if (totalOrders.value === 0) return 0;
+  return (props.returnExchanges.length / totalOrders.value) * 100;
+});
+
+// 趋势样式（升序绿色，降序红色）
+const customerTrendClass = computed(() => props.customerTrend > 0 ? 'up-trend' : 'down-trend');
+const orderTrendClass = computed(() => props.orderTrend > 0 ? 'up-trend' : 'down-trend');
+const salesTrendClass = computed(() => props.salesTrend > 0 ? 'up-trend' : 'down-trend');
+const returnRateTrendClass = computed(() => props.returnRateTrend > 0 ? 'up-trend' : 'down-trend');
+</script>
+
+<style scoped>
+.metrics-card {
+  background: rgba(15, 23, 42, 0.8);
+  border-radius: 8px;
+  padding: 16px;
+  margin-bottom: 20px;
+  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
+}
+
+.metrics-grid {
+  display: grid;
+  grid-template-columns: repeat(4, 1fr);
+  gap: 20px;
+}
+
+.metric-item {
+  text-align: center;
+  padding: 12px;
+  background: rgba(30, 41, 59, 0.5);
+  border-radius: 6px;
+}
+
+.metric-value {
+  font-size: 24px;
+  font-weight: 600;
+  color: #f8fafc;
+  margin-bottom: 6px;
+}
+
+.metric-label {
+  font-size: 14px;
+  color: #94a3b8;
+  margin-bottom: 8px;
+}
+
+.metric-trend {
+  font-size: 12px;
+}
+
+.up-trend {
+  color: #10b981; /* 绿色：上升趋势 */
+}
+
+.down-trend {
+  color: #ef4444; /* 红色：下降趋势 */
+}
+</style>