var person = new Object();
  person.name = "Nicholas";
  person.age = 29;
  person.job = "Software Engineer";
  person.sayName = function(){
  　　alert(this.name);
　　}

var person = {
  name: "Nicholas",
  age : 29,
  job: "Software Engineer",
  sayName: function(){
    alert(this.name);
  }
};

function createPerson(name,age,job){
  var o = new Object();
  o.name = name;
  o.age = age;
  o.job = job;
  o.sayname = function(){
    alert(this.name);
  }
  return o;
}
var person1 = createPerson('Nicholas',29,'software Engineer');
var person2 = createPerson('greg',27,'doctor');

function Person(name,age,job){
  this.name = name;
  this.age = age;
  this.jog = job;
  this.sayName = function(){
    alert(this.name);
  };
  //与声明函数在逻辑上是等价的
  //this.sayName = new Function('alert(this.name)');

}
var person1 = new Person("Nicholas",29,"software Engineer");
var person2 = new Person("Greg",27,"doctor");

function Person(name,age,job){
  this.name = name;
  this.age = age;
  this.job = job;
  this.sayName = sayName;
}
function sayName(){
  alert(this.name);
}
var person = new Person('小火柴','20','student')
person.sayName();
console.log(Person);

function Person(){
  Person.prototype.name = "Nicholas";
  Person.prototype.age = 29;
  Person.prototype.job = "software Engineer";
  Person.prototype.sayName = function(){
    alert(this.name);
  }
}
var person1 = new Person();
person1.sayName();//"Nicholas"
var person2 = new Person();
person2.sayName();//"Nicholas"
alert(person1.sayName == person2.sayName);//true

function Person(){};
Person.prototype = {
  constructor : Person,
  name: "Nicholas",
  age: 29,
  job: "software Engineer",
  sayName : function(){
    alert(this.name);
  }
};

function Person(){};
Person.prototype = {
  name: "Nicholas",
  age: 29,
  job: "software Engineer",
  sayName : function(){
    alert(this.name);
  }
};
Object.defineProperty(Person.prototype,"constructor",{
  enumerable : false,
  value : Person
});

function Person(){}
var friend = new Person();
Person.prototype = {
  constructor: Person,
  name: "Nicholas",
  age: 29,
  job: "Software Engineer",
  sayName: function(){
    alert(this.name);
  }
};
friend.sayName();//error

function Person(){}
Person.prototype = {
  constructor: Person,
  name: "Nicholas",
  age: 29,
  job: "Software Engineer",
  friend : ["shelby","Court"],
  sayName: function(){
    alert(this.name);
  }
};
var person1 = new Person();
var person2 = new Person();
person1.friends.push("Van");
alert(person1.friends);//["shelby","Court","Van"];
alert(person2.friends);//["shelby","Court","Van"];
alert(person1.friends === person2.friends);//true

function Person(name,age,job){
  this.name = name;
  this.age = age;
  this.job = job;
  this.friends = ["shelby","Court"];
}
Person.prototype = {
  constructor: Person,
  sayName : function(){
    alert(this.name);
  }  
}
var person1 = new Person("Nicholas",29,"Software Engineer");
var person2 = new Person("Greg",27,"Doctor");
person1.friends.push("Van");
alert(person1.friends);// ["shelby","Court","Van"];
alert(person1.friends);// ["shelby","Court"];
alert(person1.friends === person2.friends);//false
alert(person1.sayName === person2.sayName);//true

function Person(name,age,job){
  //属性
  this.name = name;
  this.age = age;
  this.job = job;
  //方法
  if(typeof this.sayName != "function"){
    Person.prototype.sayName = function(){
      alert(this.name);
    };
  }
}
var friend = new Person("Nicholas",29,"Software Engineer");
friend.sayName();

function Person(name,age,job){
  var o = new Object();
  o.name = name;
  o.age = age;
  o.job = job;
  o.sayName = function(){
    alert(this.name);
  };
  return o;
}
var friend = new Person("Nicholas",29,"Software Engineer");
friend.sayName();//"Nicholas"

function SpecialArray(){
  //创建数组
  var values = new Array();
  //添加值
  values.push.apply(values,arguments);
  //添加方法
  values.toPipedString = function(){
    return this.join('|');
  };
  //返回数组
  return values;
}
var colors = new SpecialArray("red","blue","green");
alert(colors.toPipedString());//"red|blue|green"  

function Person(name,age,job){
  //创建要返回的对象
  var o = new Object();
  //可以在这里定义私有变量和函数
  //添加方法
  o.sayName = function(){
    alert(name);
  };
  //返回对象
  return o;
}
//在稳妥模式创建的对象中，除了使用sayName()方法之外，没有其他方法访问name的值
var friend = Person("Nicholas",29,"Software Engineer");
friend.sayName();//"Nicholas"