声明这个函数在头文件中，那么从你的应用程序中调用它。
Declare this function in a header and then call it from your application.
第一种方式是从文件中引用，第二种是在文档自身调用。
The first way is to link to the file directly, and the second is to include it on the page itself.
第一种方式是从文件中引用，第二种是在文档自身调用。
The first way is to link to the file directly, and the second is to include it on the page itself.
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