Question

我有这个脚本：

@echo off
Ping www.google.nl -n 1 -w 1000 >nul 2>nul
if errorlevel 1 (set internet=Nao conectado) else (set internet=Connectado) >nul 2>nul

echo %internet%

    if %internet%=Nao conectado goto 1
    if %internet%=Conectado goto 2

    :1 exit

    :2
    echo hi
    pause

但是条件if %internet%无效。怎么了？

Answer 1

IF命令有两件事。

1）如果您阅读了帮助文件，您会注意到字符串比较的语法要求使用两个等号。

2）如果需要比较带空格的字符串，则需要用引号将比较括起来。

if "%internet%"=="Nao conectado" goto 1

Answer 2

我想您可以简化它，而不是不必要地设置变量：

df <- data.frame(
  date = seq(as.Date("2018/01/01"), by = "day", length.out = 20), 
  val = sample(1:10, 20, replace=TRUE)) %>% 
  mutate(weekday = strftime(date,'%A'))

    date        val weekday     val_recent
1   20/01/2018  4   Saturday    4
2   19/01/2018  3   Friday      3
3   18/01/2018  4   Thursday    4
4   17/01/2018  10  Wednesday   10
5   16/01/2018  2   Tuesday     2
6   15/01/2018  6   Monday      6
7   14/01/2018  1   Sunday      1
8   13/01/2018  9   Saturday    4
9   12/01/2018  9   Friday      3
10  11/01/2018  7   Thursday    4
11  10/01/2018  8   Wednesday   10
12  9/01/2018   6   Tuesday     2
13  8/01/2018   10  Monday      6
14  7/01/2018   6   Sunday      1
15  6/01/2018   3   Saturday    4
16  5/01/2018   3   Friday      3
17  4/01/2018   10  Thursday    4
18  3/01/2018   4   Wednesday   10
19  2/01/2018   2   Tuesday     2
20  1/01/2018   8   Monday      6

或者：

@Echo Off
Ping www.google.nl -n 1 -w 1000 >Nul 2>&1
If ErrorLevel 1 Exit /B
Echo hi
Pause

检查互联网连接，如果是，请对批处理文件执行操作

2 个答案: