DEF SDK 依赖 Node.js（4.x），如果您的机器上没有对应版本的 Node.js，请到 官网下载 安装
npm i def-cli -g
等待片刻，待安装完成之后在终端执行 def --version，正常返回版本信息，表示安装成功。
Cli 当在终端执行 SDK 命令时如果有新版本发布会显示更新提示信息，按照提示升级即可。
Core 新版本发布后用户端会自动更新，使用者一般不需要关心。如果有大版本升级（一般存在与当前版本不兼容的情况），会让用户确认是否升级。
npm rm -g def-cli
FAQs
The Development Environment For Frontend
We found that def-cli demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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