JS instantiation method

Constructor Pattern

 function obj1(name,age){
    
    this.name=name;
    this.age=age;
    this.identity=function(){
    
        var li=document.createElement("p");
        var txt=document.createTextNode(" Bai Xiaochun ");
        li.appendChild(txt);
        document.body.appendChild(li);
    }
}
var person2=new obj1(' Bai Xiaochun ',123);
person2.identity();
alert(person2.name);

Factory mode

function obj2(){
    
     var lio=new Object(); // Create objects , Object property assignment 
     lio.name='lio';
     lio.attr=' male ';
     lio.identity=function(){
    
         var li=document.createElement("p");
         var txt=document.createTextNode(" Bai Xiaochun ");
         li.appendChild(txt);
         document.body.appendChild(li);
     };
     return lio;
 }
 var person=obj2();
 //alert(person.name);

Archetypal model

function obj3(){
    
   //this.name='lio';
}
obj3.prototype.name='lio';
obj3.prototype.identity= function (name) {
    
    alert(" It's actually "+name);
};
var person3=new obj3();
// Check whether it is in the instance or in the prototype 
alert(person3.hasOwnProperty("name"));
alert(person3.hasOwnProperty("rename"));
person3.identity(' Bai Xiaochun ');

Mixed mode

function obj4(age) {
    
    this.age=age;
    this.rename='aaaa';
};
obj4.prototype={
    
    constructor:obj4,
    name:'lio',
    age:123,
    identity: function (name) {
    
        alert(name+" Actually, it's Bai Xiaochun ");
    }
};
var person4=new obj4(18);
alert(person4.hasOwnProperty("age"));//true
person4.identity('lio');