JS 7 Ways to create objects (i)

1. Factory mode (Factory)

1 functionCreateperson (name, age, title) {2     varo =NewObject ();3O.name =name;4O,age =Age ;5O.title =title;6O.sayname =function(){7Alert This. Name);8     }9     returno;Ten }    One  A varPerson1 = Createperson ("Greg", "Doctor"); - varPerson2 = Createperson ("Lisa", "Teacher");

Factory mode does not recognize the type of object.

2. Constructor mode (Constructor)

1 functionPerson (name, age, job) {2      This. Name =name;3      This. Age =Age ;4      This. Job =job;5      This. Sayname =function(){6Alert This. Name);7     }8 }9 varPerson1 =NewPerson ("Nicholas", "Software Engineer");Ten varPerson2 =NewPerson ("Greg", "Doctor");

By convention, constructors should always start with an uppercase letter.

To create a new instance of a person, you must use the new operator.

Person1 and Person2 each hold a different instance of person, both of which have a constructor attribute that points to person:

Alert (Person1.constructor = = person)  //truealert (person2.constructor = = person)  //  True

Constructor problem: All methods in the constructor are recreated on each instance.

Alert (Person1.sayname = = person2.sayname);    // false

JS 7 Ways to create objects (i)