我无法在追加到数组后修改项目

您的问题是您的结构具有非指针切片。在所有结构中，像这样将切片定义为指针切片

Rooms []*Room

您还需要定义函数以获取指针值，如下所示

func(room *Room) {}

详细说明。Go是按值传递。每当您从原始切片之一中拉出某些东西并将其传递给您的功能之一时，它都会得到一个副本。使用指针会修改切片中的实际值。

请参阅此示例。https://play.golang.org/p/ZThHrP0pds

package mainimport (    "fmt")type Thing struct {    Name string}func main() {    things := []Thing{}    thing := Thing{"thing1"}    // add to slice    // note that this is a function call    things = append(things, thing)    // attempt to change    thing.Name = "thing2"    fmt.Println(things[0].Name) // prints thing1    fmt.Println(thing.Name)     // prints thing2    fmt.Println("------")    // try again    thing3 := things[0]    thing3.Name = "thing3"    // fail again    fmt.Println(things[0].Name) // prints thing1    fmt.Println(thing3.Name)     // prints thing3    fmt.Println("------")    // do this instead    betterThings := []*Thing{} // slice of pointers    betterThing := &Thing{"thing2"} // betterThing is of type *Thing    // add to slice    betterThings = append(betterThings, betterThing)    // successfully change    betterThing.Name = "thing2"    fmt.Println(betterThings[0].Name) // prints thing2    fmt.Println(betterThing.Name)     // prints thing2}