string - PowerShell字符串串联给出了换行符

Question

注意:Java / Closure Compiler的实际错误来自 --js-outputfile 中缺少的t!
我有以下PowerShell脚本:

cls
$jsFiles = @();

Get-ChildItem | Where {$_.PsIsContainer} | Foreach {
    $dir = $_.FullName;
    $jsFile = $dir + "\" + $_.Name + ".js";
    if (Test-Path ($jsFile)) {
        $jsFiles += $jsFile;
    }
}

$wd = [System.IO.Directory]::GetCurrentDirectory();

# Build Closure Compiler command line call
$cmd = @("-jar $wd\..\ClosureCompiler\compiler.jar");

Foreach ($file in $jsFiles) {
    # Both insert a newline!

    $cmd += "--js $file";
    #$cmd = "$cmd --js $file";
}


$cmd = "$cmd --js_ouput_file $wd\all.js";

Invoke-Expression "java.exe $cmd"

问题是在每个 +=或 $cmd = "$cmd str"调用上都插入了换行符!
Echoargs给我这个输出:

Arg 0 is <-jar>
Arg 1 is <S:\ome\Path\compiler.jar>
Arg 2 is <--js>
Arg 3 is <S:\ome\Path\script1.js>
Arg 4 is <--js>
Arg 5 is <S:\ome\Path\script2.js>
...
Arg 98 is <--js_ouput_file>
Arg 99 is <S:\ome\Path\all.js>

因此(可能)，我从 java.exe收到一些错误:

java.exe : "--js_ouput_file" is not a valid option
At line:1 char:1
+ java.exe -jar ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: ("--js_ouput_file" is not a valid option:String) [], RemoteException
    + FullyQualifiedErrorId : NativeCommandError

Answer 1

尝试重写为简单得多的版本:

cls

$wd = [System.IO.Directory]::GetCurrentDirectory();

# Build Closure Compiler command line call
$cmd = "-jar $wd\..\ClosureCompiler\compiler.jar";

$arrayOfJs = Get-ChildItem -Recurse -Include "*.js" | % { "--js $_.FullName" };

$cmd += [string]::Join(" ", $arrayOfJs);

Invoke-Expression "java $cmd --js_ouput_file $wd\all.js"