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一般没必要使用[]*type

func (p *ProductService) SelectAll() []*entity.Food {

一般情况下不需要
[]*entity.Food
而是写成
[]entity.Food
因为slice底层存放的是对象的地址

func change(s []string) {
    s[0] = "y"
}

func main() {
    input := []string{"x"}
    change(input)
    fmt.Println(input)
}

你可以试一下打印结果,然后思考一下为什么

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