You then can call the functions using standard function call syntax, by combining this prefix with the name of the method to be invoked.

然后通过组合该前缀与被调用方法的名称，可以使用标准的函数调用语法调用函数。

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To make this method a little easier, I wrap the access to the variable in a second function that takes a configuration key name and a default value, as shown below.

为使这个方法更加简单，将对变量的访问封装在第二个函数中，该函数使用配置键名及一个缺省值作为参数，如下所示。

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When an instance receives a message, it executes a corresponding function, called a method, which has the same name as the message.

当实例接收消息时，它执行相应的功能，称为方法，它有与消息相同的名称。

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