mac m1 重装brew、node踩得坑！！！！！1、卸载brew 2、安装brew 回车运行，按照提示运行下去就可以

1、卸载brew

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)"

2、安装brew

/bin/zsh -c "$(curl -fsSL https://gitee.com/huwei1024/HomebrewCN/raw/master/Homebrew.sh)"

回车运行，按照提示运行下去就可以了;

做完上面的傻瓜式操作，理论上就OK了，但是我这边出现了安装完后用不了的错误;

command not found : brew

经过检查后发现，是因为M1芯片的包安装位置不在是以前的/usr/local/ 而是/opt/homebrew，所以要将配置文件里的环境变量改过来;

1、修改环境变量
```
vim ~/.zshrc
```

2、编辑（.zshrc文件）如果有旧的环境就修改，没有就新增

# HomeBrew
export HOMEBREW_BOTTLE_DOMAIN=https://mirrors.ustc.edu.cn/homebrew-bottles
export PATH=/opt/homebrew/bin:$PATH
export PATH=/opt/homebrew/sbin:$PATH
# HomeBrew END

3、生效环境变量
```
 source ~/.zshrc
```
4、测试
```
 brew -v
```
5、完成

3、安装node

1、m1不支持node15以上的版本，我这边选择node10版本；

brew install node@10
2、执行brew install node@10后提示（不是最高版本需要本地配置）

==> Downloading mirrors.aliyun.com/homebrew/ho… ######################################################################## 100.0% ==> Pouring node@10-10.21.0.catalina.bottle.tar.gz ==> Caveats node@10 is keg-only, which means it was not symlinked into /opt/homebrew,because this is an alternate version of another formula.

If you need to have node@10 first in your PATH run: echo 'export PATH="/usr/local/opt/node@10/bin:$PATH"' >> /Users/kelin/.bash_profile

For compilers to find node@10 you may need to set: export LDFLAGS="-L/opt/homebrew/opt/node@10/lib" export CPPFLAGS="-I/opt/homebrew/opt/node@10/include" ==> Summary 🍺 /opt/homebrew/Cellar/node@10/10.21.0: 4,302 files, 54.0MB
3、关联node10版本

forum-front kelin$ brew link node@10 Warning: node@10 is keg-only and must be linked with --force

If you need to have this software first in your PATH instead consider running: echo 'export PATH="/opt/homebrew/opt/node@10/bin:$PATH"' >> /Users/kelin/.zshrc
4、执行强制关联低版本命令：brew link --force --overwrite node@10

brew link --force --overwrite node@10
5、将配置写到配置文件

echo 'export PATH="/opt/homebrew/opt/node@10/bin:$PATH"' >> /Users/kelin/.zshrc
6、生效环境变量

source ~/.zshrc
7、查看修改后的版本

node -v v10.21.0