javascript中的封装多态和继承

(function(windows,undefined){

vari=0;//相对外部环境来说,这里的i就算是封装了

})(window,undefined);

(function(windows,undefined){

//父类

functionPerson(){}

Person.prototype.name="nameinPerson";

//子类

functionStudent(){}

Student.prototype=newPerson();//修复原型

Student.prototype.constructor=Student;//构造函数

Student.prototype.supr=Person.prototype;//父类

//创建子类实例

varstu=newStudent();

Student.prototype.age=28;

Student.prototype.name="nameinStudentinstance";

//打印子类成员及父类成员

alert(stu.name);//nameinStudentinstance

alert(stu.supr.name);//nameinPerson

alert(stu.age);//28

})(window,undefined);

//这就是继承了

(function(windows,undefined){

//父类

functionPerson(){}

Person.prototype.name="nameinPerson";

Person.prototype.learning=function(){

alert("learninginPerson")

}

//子类

functionStudent(){}

Student.prototype=newPerson();//修复原型

Student.prototype.constructor=Student;//构造函数

Student.prototype.supr=Person.prototype;//父类

Student.prototype.learning=function(){

alert("learninginStudent");

}

//工人

functionWorker(){}

Worker.prototype=newPerson();//修复原型

Worker.prototype.constructor=Worker;//构造函数

Worker.prototype.supr=Person.prototype;//父类

Worker.prototype.learning=function(){

alert("learninginWorker");

}

//工厂

varpersonFactory=function(type){

switch(type){

case"Worker":

returnnewWorker();

break;

case"Student":

returnnewStudent();

break;

}

returnnewPerson();

}

//客户端

varperson=personFactory("Student");

person.learning();//learninginStudent

person=personFactory("Worker");

person.learning();//learninginWorker

})(window,undefined);

原文链接：/article/4867788.html