go multipart/form-data 文件大小，文件信息，处理后缀

	for i := 1; i <= 9; i++ {
		name := fmt.Sprintf("image%d", i)
		file, header, err := r.FormFile(name)
		if err != nil {
			logs.DebugPrint(err.Error())
			break
		}

		logs.DebugPrint(header.Filename, header.Header, header.Size)
		if header.Size > mewNet.MaxImageSize {
			code, msg, debugMsg = j.CodeContentTooLong, j.MsgContentTooLong, fmt.Sprintf("max size:%v b 	upload size:%v b", header.Size, mewNet.MaxImageSize)
		}

		index := strings.LastIndex(header.Filename, ".")
		if index < 0 {
			code, msg, debugMsg = j.CodeSaveImageError, j.MsgSaveImageError, "not image type"
			return
		}
		subfix := header.Filename[index:]
		switch subfix {
		case ".jpg", ".jpeg", ".png", ".ico", ".gif", ".wbmp", ".bmp", ".svg", ".webp":
		default:
			code, msg, debugMsg = j.CodeSaveImageError, j.MsgSaveImageError, "not image type"
			return
		}
		imgType = append(imgType, subfix)
		fileNames = append(fileNames, name)
		files = append(files, file)
	}