When you want to create an atomic value of one of the time-oriented data types, use a type-constructor function and provide the string representation as an argument.

如果需要创建与时间相关的数据类型的单个值，可以使用类型构造器函数并提供时间的字符串表示形式作为参数。

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It then calls the friend function spacefriend and passes the class object address as its argument, and calls the template function, beginning with integer types and then floating data types.

然后，调用友元函数spacefriend并将类对象的地址作为其参数传递。然后调用template函数，先使用整数类型，然后使用浮点数据类型。

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To access derived data types, you use the copy_userdata function, which copies the required data from a non-vue variable, that is, from memory pointed by an argument to a vue script variable.

要想访问派生的数据类型，应该使用copy_userdata函数，它把所需的数据从非vue变量(也就是从参数指向的内存)复制到Vue脚本变量。

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