1.下载好并unzip后，在root目录下，新建.bash_profile跟.zshrc文件
2.在.bash_profile文件中添加如下代码:
export PATH=[FLUTTER_INSTALL_PATH]/flutter/bin:$PATH
export PUB_HOSTED_URL=https://pub.flutter-io.cn
export FLUTTER_STORAGE_BASE_URL=https://storage.flutter-io.cn
3.在.zshrc文件中添加如下代码：
source ~/.bash_profile
