Powershell args充当占位符

function test-conn
{
Test-Connection -Count 3 -ComputerName $args
#args充当占位符的作用，这个占位符必须以args命名，否则不能识别，会抛出异常
}
Set-Alias tc Test-Conn
tc localhost

结果

tc localhost

Source        Destination     IPV4Address      IPV6Address                     
------        -----------     -----------      -----------                     
5CD60537FF    localhost       127.0.0.1        ::1                             
5CD60537FF    localhost       127.0.0.1        ::1                             
5CD60537FF    localhost       127.0.0.1        ::1      

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