Each event function contains two forms: one without any arguments, and one that contains a function as an argument.
每个事件函数都包含两种形式：一个没有任何参数，一个包含一个函数作为参数。
It can be run in one of two ways, either with a single command line argument, which should be an errno value, or without any arguments.
它能以两种方式之一运行，带单个命令行参数，该参数应该是errno值，或不带任何参数。
Creating an instance without any arguments to the constructor is valid, but you're limited to method calls that don't require a login. To have login access, use the following code.
在不为这个构造函数提供任何实参的情况下创建实例是允许的，但只限于不需要登录的那些方法调用。
Without any arguments, all bound events are removed.
如果没有参数，则删除所有绑定的事件。
Without any arguments, all bound events are removed.
如果没有参数，则删除所有绑定的事件。
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