modify：新增小程序

Sale/pages/trend/trend.wxml

@@ -0,0 +1,127 @@
+<!--pages/trend/trend.wxml-->
+<view class="container">
+  <!-- 筛选条件区域 -->
+  <view class="filter-section">
+    <view class="section-title">趋势分析</view>
+
+    <!-- 地区选择 -->
+    <view class="form-item">
+      <view class="form-label">地区</view>
+      <picker
+        class="form-picker"
+        mode="selector"
+        range="{{regions}}"
+        value="{{selectedRegionIndex}}"
+        bindchange="onRegionChange">
+        <view class="picker-text {{selectedRegionIndex === -1 ? 'placeholder' : ''}}">
+          {{selectedRegionIndex === -1 ? '全部地区' : regions[selectedRegionIndex]}}
+        </view>
+      </picker>
+    </view>
+
+    <!-- 材质选择 -->
+    <view class="form-item">
+      <view class="form-label">材质</view>
+      <picker
+        class="form-picker"
+        mode="selector"
+        range="{{materials}}"
+        value="{{selectedMaterialIndex}}"
+        bindchange="onMaterialChange">
+        <view class="picker-text {{selectedMaterialIndex === -1 ? 'placeholder' : ''}}">
+          {{selectedMaterialIndex === -1 ? '全部材质' : materials[selectedMaterialIndex]}}
+        </view>
+      </picker>
+    </view>
+
+    <!-- 时间范围选择 -->
+    <view class="form-item">
+      <view class="form-label">时间范围</view>
+      <picker
+        class="form-picker"
+        mode="selector"
+        range="{{dayRanges}}"
+        range-key="{{'label'}}"
+        value="{{selectedDayIndex}}"
+        bindchange="onDayRangeChange">
+        <view class="picker-text {{selectedDayIndex === -1 ? 'placeholder' : ''}}">
+          {{dayRanges[selectedDayIndex].label}}
+        </view>
+      </picker>
+    </view>
+
+    <!-- 查询按钮 -->
+    <view class="btn-group">
+      <button
+        class="btn-primary"
+        bindtap="onQuery"
+        loading="{{loading}}"
+        disabled="{{loading}}">
+        查询趋势
+      </button>
+      <button
+        class="btn-secondary"
+        bindtap="onReset"
+        disabled="{{loading}}">
+        重置
+      </button>
+    </view>
+  </view>
+
+  <!-- 图表展示区域 -->
+  <view class="chart-section" wx:if="{{hasData}}">
+    <view class="chart-card">
+      <view class="chart-title">价格走势图</view>
+      <view class="chart-container">
+        <ec-canvas id="mychart-dom-line" canvas-id="mychart-line" ec="{{ ec }}"></ec-canvas>
+      </view>
+    </view>
+
+    <!-- 数据统计卡片 -->
+    <view class="stats-summary">
+      <view class="stat-item">
+        <view class="stat-label">起始价格</view>
+        <view class="stat-value">¥{{startPrice}}</view>
+      </view>
+      <view class="stat-item">
+        <view class="stat-label">最新价格</view>
+        <view class="stat-value {{priceChange >= 0 ? 'up' : 'down'}}">
+          ¥{{endPrice}}
+        </view>
+      </view>
+      <view class="stat-item">
+        <view class="stat-label">价格变动</view>
+        <view class="stat-value {{priceChange >= 0 ? 'up' : 'down'}}">
+          {{priceChange >= 0 ? '+' : ''}}{{priceChange}}
+        </view>
+      </view>
+    </view>
+  </view>
+
+  <!-- 初始提示 -->
+  <view class="welcome-section" wx:if="{{!hasData && !loading}}">
+    <view class="welcome-card">
+      <view class="welcome-icon">📈</view>
+      <view class="welcome-title">价格趋势分析</view>
+      <view class="welcome-desc">选择地区和材质查看价格走势</view>
+    </view>
+  </view>
+
+  <!-- 加载状态 -->
+  <view class="loading-section" wx:if="{{loading}}">
+    <view class="loading-text">正在加载趋势数据...</view>
+  </view>
+
+  <!-- 空状态 -->
+  <view class="empty-section" wx:if="{{!hasData && searched && !loading}}">
+    <view class="empty-icon">📊</view>
+    <view class="empty-text">暂无趋势数据</view>
+    <view class="empty-hint">请尝试调整查询条件</view>
+  </view>
+
+  <!-- TDesign TabBar -->
+  <t-tab-bar value="1" theme="normal" bindchange="onTabChange">
+    <t-tab-bar-item value="0" icon="search" label="价格查询" />
+    <t-tab-bar-item value="1" icon="chart-line" label="价格趋势" />
+  </t-tab-bar>
+</view>