1、Dart sdk 安装

1、输入命令安装，如果未安装brew请输入如下命令安装brew。

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

我本地已经安装brew 输入下面命令

brew tap dart-lang/dart
brew install dart

遇到问题1
控制台输入命令brew tap dart-lang/dart ，卡住半天没反应，我就用ctrl 结束进程，然后就报如下错误

Error: Another active Homebrew update process is already in progress.
Please wait for it to finish or terminate it to continue.

ps aux | grep brew
kill -9 进程id

我怕有问题，先升级下brew

brew update
brew -v
Homebrew 2.4.2
Homebrew/homebrew-core (git revision b82eb; last commit 2019-12-09)

brew 有个默认的仓库，brew tap 你可以看成是第三方的仓库
安装好之后，可以用以下命令进行更新

$ brew update
$ brew upgrade dart
$ brew cleanup dart

输入brew install dart 然后报错如下，网络问题或是需要翻墙。

把地址复制出来在浏览器访问手动下载dartsdk-macos-x64-release.zip包，然后将下载好的文件移动到 安装dart的缓存目录下

 mv /Users/xxx/Downloads/dartsdk-macos-x64-release.zip /Users/xxx/Library/Caches/Homebrew/downloads/10ce031cba8b64019fbbe66363f720eac05c705fa88b9df6d2d77656b01537c1--dartsdk-macos-x64-release.zip

然后运行brew install dart，我运行2次才安装成功

$ dart --version
Dart VM version: 2.8.4 (stable) (Wed Jun 3 12:26:04 2020 +0200) on "macos_x64"

vscode 添加插件 dart 和Code Runner

新建一个index.dart,右键run code 控制台输出hello

main(){
  print("hello");
}