``` 在函数外部定义结构体 作用域是全局的 type Student struct { id int name string age int } func main() { var s1 Student s1.id=1 s1.name="sn" s1.age=11 fmt.Println(s1) s2:=Student{id:2,name:"lisi",age:12} fmt.Println(s2.id) fmt.Println(s2.name) fmt.Println(s2.age) //比较 s3:=Student{id:2,name:"lisi",age:12} s4:=s2 fmt.Println(s2==s3) //true fmt.Println(s2==s4) //true } ```