修复bug：导出的数据列超过26列时出现异常

@@ -599,21 +599,24 @@ func (srv StaffAssessServeice) ExportPerformanceIndicator(in *query.ExportPerfor
 		f.SetCellStyle(sheetName, axisStart, axisEnd, styleId100)
 	}
 
-	var columnIndex = 'B'
+	var columnIndex = 2
 	for i := range in.Selected {
-		axis := fmt.Sprintf("%v3", string(columnIndex))
+		colName, _ := excelize.ColumnNumberToName(columnIndex)
+		axis := fmt.Sprintf("%s3", colName)
 		f.SetCellStr(sheetName, axis, in.Selected[i].UserName) // 设置名称
 		columnIndex += 1
 	}
 
 	// 填写反馈内容
 	for i := range rowDayList {
-		var columnIndex = 'B' // 从B4开始填充数据内容
+		var columnIndex = 2 // 从B4开始填充数据内容
+
 		var rowIndex = 4 + (i * 3)
 
 		for j := range in.Selected {
-			axisStart := fmt.Sprintf("%v%v", string(columnIndex), rowIndex)
-			axisEnd := fmt.Sprintf("%v%v", string(columnIndex), rowIndex+2)
+			colName, _ := excelize.ColumnNumberToName(columnIndex)
+			axisStart := fmt.Sprintf("%v%v", colName, rowIndex)
+			axisEnd := fmt.Sprintf("%v%v", colName, rowIndex+2)
 
 			key := in.Selected[j].UserId + rowDayList[i] // key = 用户ID+日期
 			if v, ok := conditionMap[key]; ok {