浅析创建javascript对象的方法

function person (name,age) {
  var p=new Object();
  p.name=name;
  p.age=age;
  p.showMessage=function(){
    console.log("name:"+this.name+" age:"+this.age);
  }
  return p;
}
var p1=person("k1",28);
var p2=person("k2",29);
console.log(p1.showMessage==p2.showMessage);//false 不是同一个showMessage方法
console.log(p1.constructor);//[object] 都是object

function Person (name,age) {
  this.name=name;
  this.age=age;
  this.showMessage=function(){
    console.log("name:"+this.name+" age:"+this.age);
  }
}
var p1=new Person("k1",28);
var p2=new Person("k2",29);
console.log(p1.showMessage==p2.showMessage);//false 不是同一个showMessage方法
console.log(p1.constructor);//[Person]
console.log(p1 instanceof Person);// true

function Person () {
  
}
Person.prototype.name ="k";
Person.prototype.age =29;
Person.prototype.showMessage=function () {
  console.log("name:"+this.name+" age:"+this.age);
};

var p1=new Person();
p1.showMessage();//name:k age:29

var p2=new Person();
p2.showMessage();//name:k age:29

console.log(p1.showMessage==p2.showMessage);// true --引用的是同一函数
console.log(p1.constructor)//[Person] --对象识别
console.log(p1 instanceof Person)//true --对象识别
console.log(Person.prototype.isPrototypeOf(p1));// true
console.log(Object.getPrototypeOf(p1)==Person.prototype);// true

function Person () {  
};
Person.prototype.age =10;
Person.prototype.array=[1,2,3];

var p1=new Person();
var p2=new Person();
console.log(p1.array);// [1,2,3]
console.log(p2.array); //[1,2,3]
p1.array.push(4);
console.log(p1.array);//[1,2,3,4]
console.log(p2.array);//[1,2,3,4]

function Person (name,age) {
  this.name=name;
  this.age=age;
}

Person.prototype.showMessage = function() {
  console.log("name:"+this.name+" age:"+this.age);
};

var p1=new Person("k",30);
p1.showMessage();

function Person (name,age) {
  this.name=name;
  this.age=age;
  if(typeof this.showMessage!="function"){
    Person.prototype.showMessage=function(){
      console.log("name:"+this.name+" age:"+this.age);
    }
  }
}

var p1=new Person("k",30);
p1.showMessage();

function Person (name,age) {
  var o=new Object();
  o.name=name;
  o.age=age;
  o.sayName=function(){
    console.log(this.name);
  };
  return o;
}
var p1=new Person("k",28);
p1.sayName();

function MyArray(){
  var values=new Array();
  values.push.apply(values,arguments);
  //自己定义的方法
  values.toPipedString=function(){ 
    return this.join('|');
  };
  return values;
}
var colors=new MyArray("red","blue","green");
console.log(colors.toPipedString());
console.log(colors instanceof Array);

function Person (name,age) {
  var o=new Object();
  var tempAge=age;

  o.name=name;
  o.age=age;

  o.sayName=function(){
    console.log(name);
  }
  o.sayAge=function(){
    console.log(tempAge);
  }
  return o;
}

var p1=Person("k1",28);
p1.sayName(); // k1
p1.sayAge(); // 28

p1.name="k2";
p1.age=30;
p1.sayName(); // k1
p1.sayAge();  //28