$ npm install -g ling-todo --registry=http://registry.mirror.cqupt.edu.cn

 Commands:

    add|a [content]  add a todo to your list; 添加一条 Todo.
    del|ok [id]      delete a todo from you list; 完成一条 Todo.
    list|l           list your todo list; 列出所有 Todo 的项目.

  Options:

    -h, --help     output usage information
    -v, --version  output the version number