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关于`defer` Golang 官方博客专门发文[介绍过三条规则](https://blog.golang.org/defer-panic-and-recover)：
> 1. defer语句被求值时，被defer调用的函数参数即时求值 A deferred function's arguments are evaluated when the defer statement is evaluated.
`Defer statements`的[Spec](https://golang.org/ref/spec#Defer_statements)中有这么一句描述:
> Each time a "defer" statement executes, the function value and parameters to the call are evaluated as usual and saved anew but the actual function is not invoked.
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