JavaScript创建对象方式总结【工厂模式、构造函数模式、原型模式等】

var o = {a: 1};
var o2=new Object();
o2.a=1;

function parent(name,age){
  var Child = new Object();
  Child.name=name;
  Child.age=age;
  Child.sayHi=function(){
    console.log("Hi");
  }
  return Child;
};
var x = Parent("Tom",12);
console.log(x.name); //Tom
x.sayHi(); //Hi

function Parent(name,age){
  this.name=name;
  this.age=age;
  this.sayHi=function(){
    console.log("Hi");
  };
}
var x = new Parent("Tom",12);
console.log(x.name); //Tom
x.sayHi(); //Hi

function Parent(name,age){
  Parent.prototype.name=name;
  Parent.prototype.age=age;
  Parent.prototype.sayHi=function(){
    console.log("Hi");
  };
}
var x = new Parent("Tom",12);
console.log(x.name); //Tom
x.sayHi(); //Hi

function Parent(name,age){
  Parent.prototype.name=name;
  Parent.prototype.age=age;
  Parent.prototype.arr=["123","we"];
  Parent.prototype.sayHi=function(){
    console.log("Hi");
  };
}
var x = new Parent("Tom",12);
var y = new Parent("Tom1",12);
x.arr.push("x");
y.arr.push("y");
console.log(x.arr);//["123", "we", "x", "y"]
console.log(y.arr);//["123", "we", "x", "y"]

function Parent(name,age){
　　//只把属性留在这里定义，方法放在原型对象中
  this.name=name;
  this.age=age;
}
//第一种方式
Parent.prototype.sayHi=function(){
  console.log("Hi");
};
//第二种方式
//由于采用对象字面量，因此必须修正其constructor属性；
Parent.prototype={
  constructor:Parent,
  sayHi:function(){
    console.log("Hi");
  }
}
var x = new Parent("Tom",12);
console.log(x.name); //Tom
x.sayHi(); //Hi

function Parent(name,age){
  this.name=name;
  this.age=age;
  if( typeof this.sayHi !="function"){
    Parent.prototype.sayHi=function(){
      console.log("Hi");
    };
  }
}
var x = new Parent("Tom",12);
console.log(x.name); //Tom
x.sayHi(); //Hi

function parent(name,age){
  var Child = new Object();
  Child.name=name;
  Child.age=age;
  Child.sayHi=function(){
    console.log("Hi");
  }
  return Child;
};
var x = Parent("Tom",12);
console.log(x.name); //Tom
x.sayHi(); //Hi

function Parent(name,age){
  var o=new Object();
　　 //私有变量或者方法
  var name=name,
    age=age;
  o.sayName=function(){
　　　　 //name前面没有this
    console.log(name+" "+age)
  }
  return o;
}
var x = Parent("Tom",12);
x.sayName(); //Tom 12