如何使用 Powershell 修改父作用域变量 [英] How to modify parent scope variable using Powershell

问题描述

我对 powershell 还很陌生，我只是不知道如何修改父作用域中的变量:

I'm fairly new to powershell, and I'm just not getting how to modify a variable in a parent scope:

$val = 0
function foo()
{
    $val = 10
}
foo
write "The number is: $val"

当我运行它时，我得到:

When I run it I get:

The number is: 0

我希望它是 10.但是 powershell 正在创建一个新变量，将其隐藏在父作用域中.

I would like it to be 10. But powershell is creating a new variable that hides the one in the parent scope.

我已经尝试过这些，但没有成功(根据文档):

I've tried these, with no success (as per the documentation):

$script:$val = 10
$global:$val = 10
$script:$val = 10

但可以这么说，这些甚至不能编译".我错过了什么?

But these don't even 'compile' so to speak. What am I missing?

推荐答案

您不需要使用全局作用域.shell 控制台中可能已经存在同名变量，您可以改为更新它.使用脚本范围修饰符.使用范围修饰符时，不要在变量名中包含 $ 符号.

You don't need to use the global scope. A variable with the same name could have been already exist in the shell console and you may update it instead. Use the script scope modifier. When using a scope modifier you don't include the $ sign in the variable name.

$script:val=10

$script:val=10

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