Copier是Golang的复制版，它从一个结构复制到了另一个结构。它具有以下特点：
如果名字匹配，就从一个场景复制到另一个场景
如果方法名和场景名匹配，就从方法复制到场景
如果场景名和方法名匹配，就从场景复制到方法
从片复制到片
从结构复制到片
示例代码：
import . "github.com/jinzhu/copier"type User struct { Name string Role string Age int32} func (user *User) DoubleAge() int32 { return 2 * user.Age} type Employee struct { Name string Age int32 DoubleAge int32 EmployeId int64 SuperRule string}func (employee *Employee) Role(role string) { employee.SuperRule = "Super " + role}user := User{Name: "Jinzhu", Age: 18, Role: "Admin"}employee := Employee{}Copy(&employee, &user)// employee => Employee{ Name: "Jinzhu", // Copy from field// Age: 18, // Copy from field// DoubleAge: 36, // Copy from method// EmployeeId: 0, // Just ignored// SuperRule: "Super Admin", // Copy to method// }// Copy struct to sliceuser := User{Name: "hello", Age: 18, Role: "User"}employees := []Employee{}Copy(&employees, &user)// employees => [{hello 18 0 36 Super User}]// Copy slice to sliceusers := []User{{Name: "Jinzhu", Age: 18, Role: "Admin"}, {Name: "jinzhu 2", Age: 30, Role: "Dev"}}employees := []Employee{}Copy(&employees, &users)// employees => [{hello 18 0 36 Super User} {Jinzhu 18 0 36 Super Admin} {jinzhu 2 30 0 60 Super Dev}]
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