feat(forecast-form): 添加销售预测数据下载功能

src/components/forecast-form/forecast-form-mixin.js

@@ -59,7 +59,7 @@
 
 // API接口导入
 import { addForecast, updateForecast, getForecastDetail } from '@/api/forecast'
-import { addSalesForecastMain, updateSalesForecastMain, getSalesForecastSummaryByMonth, exportSalesForecastTemplate } from '@/api/forecast/forecast-summary'
+import { addSalesForecastMain, updateSalesForecastMain, getSalesForecastSummaryByMonth, exportSalesForecastTemplate, exportSalesForecastSummaryByYearMonth } from '@/api/forecast/forecast-summary'
 import { getUserLinkGoods } from '@/api/order/sales-order'
 
 // 常量和枚举导入
@@ -214,6 +214,8 @@ export default {
 
       /** 模板下载加载状态 */
       templateLoading: false,
+      /** 数据下载加载状态 */
+      dataExportLoading: false,
 
       /** 客户选项列表
        * @type {Array<CustomerOption>}
@@ -1358,6 +1360,50 @@ export default {
     },
 
     /**
+     * 下载销售预测数据（按年月）
+     * @returns {Promise<void>}
+     * @this {ForecastFormMixinComponent & Vue}
+     */
+    async handleDownloadData() {
+      const year = typeof this.formData.year === 'string' ? parseInt(this.formData.year, 10) : Number(this.formData.year)
+      const month = Number(this.formData.month)
+      if (!year || !month) {
+        this.$message && this.$message.warning('请先选择年份和月份')
+        return
+      }
+
+      try {
+        this.dataExportLoading = true
+        const res = await exportSalesForecastSummaryByYearMonth(year, month)
+
+        const disposition = res?.headers?.['content-disposition'] || res?.headers?.['Content-Disposition']
+        const defaultMonth = String(month).padStart(2, '0')
+        let filename = `销售预测汇总_${year}-${defaultMonth}.xlsx`
+        if (disposition) {
+          const utf8Match = /filename\*=UTF-8''([^;\n]+)/i.exec(disposition)
+          const plainMatch = /filename="?([^;\n"]+)"?/i.exec(disposition)
+          const raw = utf8Match ? decodeURIComponent(utf8Match[1]) : (plainMatch ? plainMatch[1] : '')
+          if (raw) filename = raw
+        }
+
+        const blob = new Blob([res.data], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' })
+        const url = window.URL.createObjectURL(blob)
+        const a = document.createElement('a')
+        a.href = url
+        a.download = filename
+        document.body.appendChild(a)
+        a.click()
+        document.body.removeChild(a)
+        window.URL.revokeObjectURL(url)
+      } catch (e) {
+        console.error('下载数据失败:', e)
+        this.$message && this.$message.error('下载数据失败，请稍后重试')
+      } finally {
+        this.dataExportLoading = false
+      }
+    },
+
+    /**
      * 导入所选物料到下方表格
      * @description 仅在点击"导入物料"按钮后，将选择的物料行添加到表格，默认预测数量为 1
      * @returns {void}

src/components/forecast-form/index.vue

@@ -65,6 +65,15 @@
               :loading="templateLoading"
               @click="handleDownloadTemplate"
             >下载模板</el-button>
+            <el-button
+              type="success"
+              size="small"
+              icon="el-icon-download"
+              :loading="dataExportLoading"
+              style="margin-left: 8px;"
+              v-if="isEdit"
+              @click="handleDownloadData"
+            >下载数据</el-button>
           </div>
 
           <el-table

src/components/forecast-form/types.d.ts

@@ -148,6 +148,8 @@ export interface ForecastFormMixinData {
   formLoading: boolean;
   /** 模板下载加载状态 */
   templateLoading: boolean;
+  /** 数据下载加载状态 */
+  dataExportLoading: boolean;
   /** 客户选项列表 */
   customerOptions: Array<CustomerOption>;
   /** 客户选项加载状态 */
@@ -294,6 +296,8 @@ export interface ForecastFormMethods {
   loadUserLinkGoods(): Promise<void>;
   /** 下载销售预测模板 */
   handleDownloadTemplate(): Promise<void>;
+  /** 下载销售预测数据（按年月） */
+  handleDownloadData(): Promise<void>;
   /** 品牌变更处理 */
   handleBrandChange(brandId: number): void;
   /** 物料选择处理 */