sencha cmd 和 extjs6 sdk.
sencha cmd: https://www.sencha.com/products/extjs/cmd-download/
extjs6: https://www.sencha.com/
sencha cmd 安装过程将其加入系统的环境变量path中。
export PATH=${PATH}:/Users/shuanggai/bin/Sencha/Cmd/6.2.2.36
把改语句添加到 ~/.bash_profile   里面去
extjs6 解压即可。

根据默认的模板创建项目
sencha -sdk /path/to/sdk generate app MyApp /path/to/myapp
指定模板创建项目
sencha -sdk /path/to/sdk generate app -t /path/to/sdk/templates/xxxx MyApp /path/to/myapp

进入项目目录，sencha app watch

打包classic和modern
sencha app build
仅打包classic
sencha app build classic
仅打包modern
sencha app build modern