完善小程序

insurance_backend/utils/excelExport.js

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+const ExcelJS = require('exceljs');
+
+/**
+ * Excel导出工具类
+ */
+class ExcelExport {
+  /**
+   * 创建Excel工作簿并导出数据
+   * @param {Array} data - 要导出的数据
+   * @param {Array} columns - 列定义 [{ header: '列名', key: '字段名', width: 宽度 }]
+   * @param {String} sheetName - 工作表名称
+   * @returns {Promise<Buffer>} Excel文件Buffer
+   */
+  static async exportToExcel(data, columns, sheetName = 'Sheet1') {
+    const workbook = new ExcelJS.Workbook();
+    const worksheet = workbook.addWorksheet(sheetName);
+
+    // 设置列
+    worksheet.columns = columns;
+
+    // 设置表头样式
+    worksheet.getRow(1).eachCell((cell) => {
+      cell.font = { bold: true, color: { argb: 'FFFFFFFF' } };
+      cell.fill = {
+        type: 'pattern',
+        pattern: 'solid',
+        fgColor: { argb: 'FF4472C4' }
+      };
+      cell.alignment = { vertical: 'middle', horizontal: 'center' };
+    });
+
+    // 添加数据
+    data.forEach((item) => {
+      worksheet.addRow(item);
+    });
+
+    // 自动调整列宽
+    worksheet.columns.forEach((column) => {
+      if (!column.width) {
+        const maxLength = Math.max(
+          column.header.length,
+          ...worksheet.getColumn(column.key).values.map(v => 
+            v ? String(v).length : 0
+          )
+        );
+        column.width = Math.min(Math.max(maxLength + 2, 10), 50);
+      }
+    });
+
+    // 生成Excel文件Buffer
+    const buffer = await workbook.xlsx.writeBuffer();
+    return buffer;
+  }
+
+  /**
+   * 格式化日期
+   * @param {Date|String} date - 日期
+   * @returns {String} 格式化后的日期字符串
+   */
+  static formatDate(date) {
+    if (!date) return '';
+    const d = new Date(date);
+    const year = d.getFullYear();
+    const month = String(d.getMonth() + 1).padStart(2, '0');
+    const day = String(d.getDate()).padStart(2, '0');
+    const hours = String(d.getHours()).padStart(2, '0');
+    const minutes = String(d.getMinutes()).padStart(2, '0');
+    const seconds = String(d.getSeconds()).padStart(2, '0');
+    return `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`;
+  }
+
+  /**
+   * 格式化金额
+   * @param {Number} amount - 金额
+   * @returns {String} 格式化后的金额字符串
+   */
+  static formatAmount(amount) {
+    if (!amount && amount !== 0) return '';
+    return `¥${Number(amount).toFixed(2)}`;
+  }
+
+  /**
+   * 格式化状态
+   * @param {String} status - 状态值
+   * @param {Object} statusMap - 状态映射表
+   * @returns {String} 状态文本
+   */
+  static formatStatus(status, statusMap) {
+    return statusMap[status] || status || '';
+  }
+}
+
+module.exports = ExcelExport;
+