下载 SDK
SDK 下载链接模板:https://storage.googleapis.com/dart-archive/channels/<stable/dev>/release/<release>/sdk/dartsdk-<platform>-<architecture>-release.zip
按照以下规则修改模板，即可得出下载地址：
<stable/dev> - 选择稳定/开发版，可选项：stable，dev
<release> - 版本号，比如：2.0.0, 2.0.0-dev.64.1
<platform> - 平台，可选项：windows, macos, linux
<architecture> - 系统架构，32位或64位，可选项：ia32，x64
地址示例：
https://storage.googleapis.com/dart-archive/channels/stable/release/2.0.0/sdk/dartsdk-windows-ia32-release.zip 50
https://storage.googleapis.com/dart-archive/channels/stable/release/2.0.0/sdk/dartsdk-macos-x64-release.zip 25
https://storage.googleapis.com/dart-archive/channels/stable/release/2.0.0/sdk/dartsdk-linux-ia32-release.zip 14
安装
下载：wget -c https://storage.googleapis.com/dart-archive/channels/stable/release/2.8.2/sdk/dartsdk-linux-x64-release.zip
解压
unzip dartsdk-linux-x64-release.zip
设置环境变量
export PATH=$PWD/dart-sdk/bin:$PATH
OK了
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