Revert "update 新增导出csv文件"

This reverts commit 874ab4ba9468402bf8f53c14e37b4b0d0f8e9197.

extend/export/csv.go

@@ -1,38 +0,0 @@
-package export
-
-import (
-	"encoding/csv"
-	"os"
-)
-
-type CsvExport struct {
-}
-
-func (e *CsvExport) ExportData(fileName string, datas [][]string, comma ...rune) error {
-	// 打开文件
-	file, err := os.Create(fileName)
-	if err != nil {
-		return err
-	}
-	defer file.Close()
-
-	// 写入UTF-8 BOM，避免使用Microsoft Excel打开乱码
-	file.WriteString("\xEF\xBB\xBF")
-
-	// 创建csv writer
-	writer := csv.NewWriter(file)
-	if len(comma) > 0 {
-		writer.Comma = comma[0]
-	}
-	defer writer.Flush()
-
-	// 写入数据
-	for _, data := range datas {
-		err = writer.Write(data)
-		if err != nil {
-			return err
-		}
-	}
-
-	return nil
-}