1.创建文件

    filePath:="./show.txt"
    _,err:=os.Create(filePath)
    if err!= nil {
        fmt.Println("create file is error")
    }
    _,err:=os.OpenFile(filePath,os.O_APPEND|os.O_CREATE,0666)
    if err != nil {
        fmt.Println("create file is error")
    }

2.写文件