JavaScript 对象

• 创建了对象的一个新实例，并向其添加了四个属性：
  person=new Object();
  person.firstname="John";
  person.lastname="Doe";
  person.age=50;
  person.eyecolor="blue";
• 替代语法（使用对象 literals）：
  person={firstname:"John",lastname:"Doe",age:50,eyecolor:"blue"};
• 使用函数来构造对象：
  function person(firstname,lastname,age,eyecolor)
  {
  this.firstname=firstname;
  this.lastname=lastname;
  this.age=age;
  this.eyecolor=eyecolor;
  }
• 对象构造创建新的对象实例：
  var myFather=new person("John","Doe",50,"blue");
  var myMother=new person("Sally","Rally",48,"green");
  function person(firstname,lastname,age,eyecolor)
  {
  this.firstname=firstname;
  this.lastname=lastname;
  this.age=age;
  this.eyecolor=eyecolor;
  this.changeName=changeName;
  function changeName(name)
  {
  this.lastname=name;
  }
  }