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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This binds each variable to a particular data type, and the variable can store only data of that type.

这样就将每个变量与特定的数据类型绑定在一起，该变量只能存储那种类型的数据。

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Because the name of a variable describes both the use of a variable and its data type, you are much less likely to make coding errors involving mismatched data types.

因为变量的名字既描述了变量的用途又描述了其数据类型，这样你就不太可能出数据类型匹配上的编码错误。

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