Javascript 面向对象

创建对象的几种方式

　　1.使用Object或对象字面量创建对象

var student = new Object();
student.name = "abc";
student.age = 20;

　　 2.工厂模式创建对象

function createStudent(name,age){
  var student = new Object();
  student.name = name;
  student.age = age;
  return student;        
}

var student1 = createStudent("aaa",20);
var student2 = createStudent("bbb",21);

　　 3.构造函数模式创建对象

function Student(name,age){
  this.name = name;
  this.age = age;
  this.alertName = function(){
       alert(this.name);          
    };
}

function Fruit(name,color) {
  this.name = name;
  this.color = color;
  this.alertName = function() {
       alert(this.name);      
    };  
}

var v1 = new Student("abc",20);
var v2 = new Fruit("apple","red");

　　 4.原型模式创建对象

function Student() {
    this.name = 'easy';
    this.age = 20;
}


Student.prototype.alertName = function(){
    alert(this.name);
};

var stu1 = new Student();
var stu2 = new Student();

stu1.alertName();  //easy
stu2.alertName();  //easy

alert(stu1.alertName == stu2.alertName);  //true 二者共享同一函数