Mac安装Dart VSCode环境

一、安装Dart SDK

Dart官方的安装教程步骤很简单两步，但实际安装过程还是没有那么容易！

 $ brew tap dart-lang/dart
 $ brew install dart

执行第一条命令时，如下显示"Updating Homebrew..."很久，好吧更新brew，然后就是漫长的等待：

$ brew tap dart-lang/dart
Updating Homebrew...
==> Downloading https://homebrew.bintray.com/bottles-portable-ruby/portable-ruby--2.6.3.mavericks.bottle.tar.gz
######################################################################## 100.0%
==> Pouring portable-ruby--2.6.3.mavericks.bottle.tar.gz
==> Tapping dart-lang/dart
Cloning into '/usr/local/Homebrew/Library/Taps/dart-lang/homebrew-dart'...
remote: Enumerating objects: 6, done.
remote: Counting objects: 100% (6/6), done.
remote: Compressing objects: 100% (6/6), done.
remote: Total 6 (delta 1), reused 1 (delta 0), pack-reused 0
Unpacking objects: 100% (6/6), done.
Tapped 3 formulae (33 files, 35.4KB).
hc:~ hc$ brew install dart
Updating Homebrew...
Error: The following directories are not writable by your user:
/usr/local/share/man/man8

You should change the ownership of these directories to your user.
  sudo chown -R $(whoami) /usr/local/share/man/man8

终于更新完了brew，然后报错：The following directories are not writable by your user:/usr/local/share/man/man8，看提示是没有读写权限，于是根据提示执行加权限的命令，继续安装：

hc:~ hc$ sudo chown -R hc /usr/local/share/man/man8
Password:
hc:~ hc$ chmod u+w /usr/local/share/man/man8
hc:~ hc$ brew install dart
Updating Homebrew...
==> Homebrew is run entirely by unpaid volunteers. Please consider donating:
  https://github.com/Homebrew/brew#donations
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/core).
==> New Formulae
………………
==> Installing dart from dart-lang/dart
Error: Xcode alone is not sufficient on Mojave.
Install the Command Line Tools:
  xcode-select --install

继续报错：`Xcode alone is not sufficient on Mojave. Install the Command Line Tools，这是要安装Command Line Tools，根据提示安装Command Line Tools，此时会弹出安装对话框，一步一步往下就行。安装成功后继续安装Dart。

hc:~ hc$ xcode-select --install
xcode-select: note: install requested for command line developer tools
hc:~ hc$ brew install dart
Updating Homebrew...
==> Installing dart from dart-lang/dart
==> Downloading https://storage.googleapis.com/dart-archive/channels/stable/rele
#######                                                                   100%
==> Caveats
Please note the path to the Dart SDK:
  /usr/local/opt/dart/libexec
==> Summary

Dart终于安装成功，使用--version命令可以看到版本号。使用brew info dart命令查看dart路径/usr/local/Cellar/dart/2.5.2，后面加上/bin配置环境变量:${PATH}:/usr/local/Cellar/dart/2.5.2/bin，保存后退出：

hc:~ hc$ dart --version
Dart VM version: 2.5.2 (Tue Oct 8 16:17:11 2019 +0200) on "macos_x64"
hc:~ hc$ brew info dart
dart-lang/dart/dart: stable 2.5.2, devel 2.6.0-dev.8.2
The Dart SDK
https://www.dartlang.org/
/usr/local/Cellar/dart/2.5.2 (395 files, 559.2MB) *
  Built from source on 2019-10-31 at 15:22:38
hc:~ hc$ vim ~/.bash_profile