01. Object constructor mode

Mode 1: Object constructor mode
*Routine: Create an empty Object object before dynamically adding attributes/methods
*Scenario applicable: start with indeterminate object internal data
*Question: Too many statements

<script type="text/javascript">
    // Alone?: name:"Tom", age: 12
  var p = new Object()
  p = {}
  p.name = 'Tom'
  p.age = 12
  p.setName = function (name) {
    this.name = name
  }
  p.setaAge = function (age) {
    this.age = age
  }
  console.log(p)
</script>

02. Object Literal Quantity

Mode 2: Object Literal Quantity Mode
*Routine: Create objects using {} while specifying properties/methods
*Scenario applicable: Internal data within the object is deterministic at the start
*Problem: If multiple objects are created, there is duplicate code

<script type="text/javascript">
  var p = {
    name: 'Tom',
    age: 23,
    setName: function (name) {
      this.name = name
    }
  }
    
  console.log(p.name, p.age)
  p.setName('JACK')
  console.log(p.name, p.age)
    
  var p2 = {
    name: 'BOB',
    age: 24,
    setName: function (name) {
      this.name = name
    }
  }
</script>

03. Factory Mode

Mode 3: Factory Mode
*Routine: Dynamically create objects through factory functions and return them
*Scenario applicable: multiple objects need to be created
*Problem: Objects do not have a specific type, they are all Object types

<script type="text/javascript">
  // Factory function: A function that returns a required data
  function createPerson(name, age) {
    var p = {
      name: name,
      age: age,
      setName: function (name) {
        this.name = name
      }
    }
    return p
  }

  var p1 = createPerson('Tom', 12)
  var p2 = createPerson('JAck', 13)
  console.log(p1)
  console.log(p2)
</script>

04. Custom constructor mode

Mode 4: Custom constructor mode
*Routine: Custom constructor to create objects from new
*Scenario applicable: multiple types of identified objects need to be created
*Problem: Every object has the same data, wasting memory

<script type="text/javascript">
  function Person(name, age) {
    this.name = name
    this.age = age
    this.setName = function (name) {
      this.name = name
    }
  }

  var p1 = new Person('Tom', 12)
  var p2 = new Person('Tom2', 13)
  console.log(p1, p1 instanceof Person)
</script>

05. Constructor + Prototype Combination Mode

Mode 5: Constructor + Prototype Combination Mode
*Routine: Custom constructors, properties initialized in functions, methods added to prototypes
*Scenario applicable: multiple types of identified objects need to be created

<script type="text/javascript">
  function Person (name, age) {
    this.name = name
    this.age = age
  }
  Person.prototype.setName = function (name) {
    this.name = name
  }
  var p1 = new Person('Tom', 12)
  var p2 = new Person('JAck', 23)
  p1.setName('TOM3')
  console.log(p1)

  Person.prototype.setAge = function (age) {
    this.age = age
  }
  p1.setAge(23)
  console.log(p1.age)

  Person.prototype = {}
  p1.setAge(34)
  console.log(p1)
  var p3 = new Person('BOB', 12)
  p3.setAge(12)
</script>