安装dart sdk
现在dart是2.3.1
可通过 Chocolatey 方式安装，或者直接下载安装包。
下载的安装包其实是个壳，通过壳需要另外下载其他文件，速度很慢。
Chocolatey 类似 apt-get yum之类的包管理工具，不过Chocolatey 是在 win 下运行。
https://chocolatey.org/install
Chocolatey 有个好处就是会管理升级这些事情。而且下载速度也不错。安装在c盘下面 C:\tools
安装正式版 choco install dart-sdk 测试版 choco install dart-sdk --pre 更新dart sdk choco upgrade dart-sdk
PS C:\Users\Administrator> choco install dart-sdk Chocolatey v0.10.15 Installing the following packages: dart-sdk By installing you accept licenses for the packages. Progress: Downloading dart-sdk 2.3.1... 100% dart-sdk v2.3.1 [Approved] dart-sdk package files install completed. Performing other installation steps. The package dart-sdk wants to run ‘chocolateyInstall.ps1‘. Note: If you don‘t run this script, the installation will fail. Note: To confirm automatically next time, use ‘-y‘ or consider: choco feature enable -n allowGlobalConfirmation Do you want to run the script?([Y]es/[A]ll - yes to all/[N]o/[P]rint): a Get-BinRoot is going to be deprecated in v1 and removed in v2. It has been replaced with Get-ToolsLocation (starting with v0.9.10), however many packages no longer require a special separate directory since package folders no longer have versions on them. Some do though and should continue to use Get-ToolsLocation. PATH environment variable does not have C:\tools\dart-sdk\bin in it. Adding... PATH environment variable does not have C:\Users\Administrator\AppData\Roaming\Pub\Cache\bin in it. Adding... Downloading dart-sdk 64 bit from ‘https://storage.googleapis.com/dart-archive/channels/stable/release/2.3.1/sdk/dartsdk-windows-x64-release.zip‘ Progress: 100% - Completed download of C:\Users\Administrator\AppData\Local\Temp\dart-sdk\2.3.1\dartsdk-windows-x64-release.zip (139.54 MB). Download of dartsdk-windows-x64-release.zip (139.54 MB) completed. Hashes match. Extracting C:\Users\Administrator\AppData\Local\Temp\dart-sdk\2.3.1\dartsdk-windows-x64-release.zip to C:\tools... C:\tools Environment Vars (like PATH) have changed. Close/reopen your shell to see the changes (or in powershell/cmd.exe just type `refreshenv`). The install of dart-sdk was successful. Software installed to ‘C:\tools‘ Chocolatey installed 1/1 packages. See the log for details (C:\ProgramData\chocolatey\logs\chocolatey.log). PS C:\Users\Administrator>