参数和接收器有什么区别 [英] What is the difference between parameter and receiver

问题描述

我正在遵循Go教程，因为无法理解特定的方法签名而陷入困境:

I am following a Go tutorial and am stuck as I cant understand a particular method signature:

func (p *Page) save() error {
    filename := p.Title + ".txt"
    return ioutil.WriteFile(filename, p.Body, 0600)
}

文档对此进行了如下解释:

The docs explain this as follows:

此方法的签名如下:这是一个名为save的方法，它以指向页面的指针作为接收者p.它不带参数，并且返回错误类型的值."

This method's signature reads: "This is a method named save that takes as its receiver p, a pointer to Page . It takes no parameters, and returns a value of type error."

我不明白接收器是什么.我将其作为参数读取，但随后我希望参数位于save()中.

I cant understand what the receiver is. I would read this as it being a parameter but then I would expect a parameter to be in save().

推荐答案

接收器是您声明方法的对象.

The receiver is the object on what you declare your method.

要向对象添加方法时，请使用以下语法.

When want to add a method to an object, you use this syntax.

例如: http://play.golang.org/p/5n-N_Ov6Xz

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