该步骤给整个插件画上了句号，有效地创建了私有函数和公共函数。
This step added a Closure around the entire plug-in, effectively allowing you to create private functions and public functions.
EXPath 规范套件旨在跨各种 XML 技术协调公共函数的使用。
The EXPath suite of specifications is an attempt at harmonizing the use of common functionality across the spectrum of XML technologies.
main函数，它调用space类中使用int参数的公共函数func。
A main function calls the public function func with int arguments of class space.
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