Es6 Object.create 方法

var roles = {
   type: "Admin", // Default value of properties
   displayType : function() {  
      // 方法 which will display type of role
      console.log(this.type);
   }
}  
// Create new role type called super_role
var super_role = Object.create(roles);
super_role.displayType(); // Output:Admin  

// Create new role type called Guest
var guest_role = Object.create(roles);
guest_role.type = "Guest";
guest_role.displayType(); // Output:Guest