函数的定义与调用（Defining and Calling Functions） 当你定义一个函数时，你可以定义一个或多个有名字和类型的值，作为函数的输入（称为 参数，parameters ），也可以定义某种类型的...
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具有受保护可视性的成员函数可以由与该成员函数在同一个类中定义或其任何子类中定义的其它任何成员函数调用。
A member function with protected visibility can be invoked by any member function in the class in which it is defined or any subclasses of that class.
具有私有可视性的成员函数只能由与该成员函数在同一个类中定义的其它成员函数调用，而在子类中的成员函数不能调用该成员函数。
A member function with private visibility can only be invoked by other member functions in the class in which it is defined, but not in the subclasses.
函数调用中传递的参数顺序与函数定义中xsl： param的顺序对应。
In the function invocation, the order of parameters passed in corresponds to the the order of XSL: params in the function definition.
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