快速自动安装dart

@"%SystemRoot%\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -InputFormat
None -ExecutionPolicy Bypass -Command "iex ((New-Object
System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))" && SET
"PATH=%PATH%;%ALLUSERSPROFILE%\chocolatey\bin"

choco install dart-sdk

https://www.cnblogs.com/yangyxd/p/10026034.html