BAT脚本：等待（sleep/wait）固定时间

由于没有原生的sleep或者wait命令，需要想其他办法在batch脚本里实现这个功能。

来源：http://stackoverflow.com/questions/735285/how-to-wait-in-a-batch-script

You can ping a random address and specify the desired timeout:

ping 123.45 . 67.89 - n 1 - w 10000 > nul


And since the address does not exists, it'll wait 10,000 ms (10 seconds) and returns.

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• The -w 10000 part specifies the desired timeout in milliseconds.
• The -n 1 part tells ping that it should only tries once (normally it'd try 4 times).
• The > nul part is appended so the ping command doesn't output anything to screen.