go基础六 文件复制断点续传

复制方法一: func copyFile1(srcFile,destFile string)(int,error){ file1,err:=os.Open(srcFile) if err != nil{ return 0,err } file2,err:=os.OpenFile(destFile,os.O_WRONLY|os.O_CREATE,os.ModePerm) if err !=nil{ return 0,err } defer file1.Close() defer fil