按照官网（https://brew.sh/index_zh-cn.html）给的命令：
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
执行后 报错：
xcode-select: error: invalid developer directory '/Library/Developer/CommandLineTools'
Failed during: /usr/bin/sudo /usr/bin/xcode-select --switch /Library/Developer/CommandLineTools
从报错来看，是说 /Library/Developer/CommandLineTools 不是 xcode-select 的有效路径
那么要做的就有两件事：
1.找到 xcode-select的有效路径
2.使用有效路径替换 https://raw.githubusercontent.com/Homebrew/install/master/install 文件中的 /Library/Developer/CommandLineTools
1.查找 xcode-select的有效路径
使用命令：xcode-select 查看其用法
userNameMacBook-Pro:test userName$ xcode-select
xcode-select: error: no command option given
Usage: xcode-select [options]
Print or change the path to the active developer directory. This directory
controls which tools are used for the Xcode command line tools (for example,
xcodebuild) as well as the BSD development commands (such as cc and make).
Options:
-h, --help print this help message and exit
-p, --print-path print the path of the active developer directory
-s <path>, --switch <path> set the path for the active developer directory
--install open a dialog for installation of the command line developer tools
-v, --version print the xcode-select version
-r, --reset reset to the default command line tools path
执行：xcode-select -p找到真正的路径，输出
/Applications/Xcode.app/Contents/Developer 即 xcode-select的有效路径
2.使用有效路径：/Applications/Xcode.app/Contents/Developer
替换 https://raw.githubusercontent.com/Homebrew/install/master/install 文件中的 /Library/Developer/CommandLineTools
将https://raw.githubusercontent.com/Homebrew/install/master/install 内容复制下来，将第306和315行两处的/Library/Developer/CommandLineTools
改为/Applications/Xcode.app/Contents/Developer 并保存名为 install的文件
3.进入保存的install文件目录下，执行
ruby -e "$(cat install)"即可