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• 评论了主题 go新手对于golang接口的一点疑惑
  **Type assertions** For an expression x of interface type and a type T, the primary expression x.(T) asserts that x is not nil and that the value stored in x is of type T. The notation x.(T) is called a type assertion. 上面的内容摘录自[Golang Specification](https://golang.org/ref/spec#Type_assertions) 执行x.(T)主要是看x所存储的Value，你可以试着对r和w都reflect.ValueOf一下，其实际都是*os.File类型