powershell 使用function 拉出内存使用率

function phy_percent()
{
$men=Get-WmiObject -Class win32_operatingsystem
$allmen=($men.totalvisiblememorysize / 1kb)
$freemen = ($men.freephysicalmemory /1kb)
$permen = ((($men.totalvisiblememorysize-$men.freephysicalmemory)/$men.totalvisiblememorysize)*100)
return @($permen)
}
echo "phy_percent:$(phy_percent)%"