文件分割的小代码，可以对现有的文件进行分割，可以自己输入分割的份数，以及自定义从哪个分割点读出数据。对初学者很有帮助。-File Splitter little code, you can split an existing file, you can enter the partition number of copies of their own, and customize the split point from which the read data. Useful for begin