类型foo struct和类型foo [] struct的区别

What is the main difference between these structs?

type foo struct {
    Name string `json:"name"`
}

and

type foo []struct {
    Name string `json:"name"`
}

type foo1 struct {
    Name string `json:"name"`
}

type foo2 []struct {
    Name string `json:"name"`
}

Simple understand as

type foo2 []foo1