Mac装flutter过程和遇到的坑

**1.安装flutter ** 1.打开终端，输入：git clone -b beta https://github.com/flutter/flutter.git 2.打开 .bash_profile ,先进到.bash_profile 所在的目录，然后在终端输入open .bash_profile 3.配置export PATH=/xx/xx/flutter/bin:${PATH} 2.在终

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