Go 语言怎么使用变长参数函数？

参考资料： https://gobyexample.com/variadic-functions https://www.geeksforgeeks.org/golang-program-that-uses-func-with-variable-argument-list / https://medium.com/rungo/variadic-function-in-go-5d9b23f4c01a https://golangbot.com/variadic-functions