PowerShell 范围
示例
变量的默认范围是封闭容器。如果在脚本或其他容器之外，则范围为Global。要指定作用域，应在变量名之前添加前缀，$scope:varname如下所示：
$foo = "Global Scope"
function myFunc {
$foo = "Function (local) scope"
Write-Host $global:foo
Write-Host $local:foo
Write-Host $foo
}
myFunc
Write-Host $local:foo
Write-Host $foo输出：
Global Scope
Function (local) scope
Function (local) scope
Global Scope
Global Scope