How js creates objects and its characteristics

There are many ways to create objects in js. Each method has its own advantages and disadvantages, so it is very important to choose a suitable way to create objects. The following content introduces several ways to create objects in js. .

1. Factory pattern

function createPerson(name){
   //1、原料
    var obj=new Object();
   //2、加工
    obj.name=name;
    obj.showName=function(){
       alert(this.name);
    }
    //3、出场
     return obj;
}
var p1=createPerson('小米');
p1.showName();

Advantages: Solve the problem of creating similar objects

Disadvantages: You cannot know the type of an object

2. Constructor

function CreatePerson(name){
  this.name=name;
  this.showName=function(){
    alert(this.name);
  }
}
    var p1=new CreatePerson('小米');

Advantages: Some instances can be represented as a specific type

Disadvantages: The method will be recreated over and over again on each instance

3. Prototype

function Person(){}
Person.prototype.name="小米";
Person.prototype.showName=function(){
alert(this.name);
}
var p1=new Person();
p1.showName();

Advantages: Properties and methods are defined on the prototype, so each instance can share properties and methods

Disadvantages: Instance properties cannot be privatized

4. Hybrid (constructor prototype)

function CreatePerson(name){
  this.name=name;
}
  Create.prototype.showName=function(){
    alert(this.name);
  }
    var p1=new CreatePerson('小米');
    p1.showName();
   var p2=new CreatePerson('小米');
    p2.showName();
　　alert(p1.showName==p2.showName);//true;原因：都是在原型下面，在内存中只存在一份，地址相同

Define properties through constructors, and define methods and shared properties through prototypes.

5. Literals

person={
　　name:"小米",
　　age:23
};

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