发票打印功能，还没写完，只完成一部分功能，可以直接在界面上修改购贷单位、纳税人识别号等。字体都按正式增值税发票上各区块的字体生成打印。-Invoice printing function, not yet finished, only completed part of the function, can be directly modified buying units, taxpayer identification number on the interface etc.. Font fo