JavaScript中继承用法实例分析
本文实例分析了JavaScript中继承的用法。分享给大家供大家参考。具体如下：
//definethePersonClass
functionPerson(){}
Person.prototype.walk=function(){
alert('Iamwalking!');
};
Person.prototype.sayHello=function(){
alert('hello');
};
//definetheStudentclass
functionStudent(){
//Calltheparentconstructor
Person.call(this);
}
//inheritPerson
Student.prototype=newPerson();
//correcttheconstructorpointerbecauseitpointstoPerson
Student.prototype.constructor=Student;
//replacethesayHellomethod
Student.prototype.sayHello=function(){
alert('hi,Iamastudent');
}
//addsayGoodByemethod
Student.prototype.sayGoodBye=function(){
alert('goodBye');
}
varstudent=newStudent();
student.sayHello();
student.walk();
student.sayGoodBye();
//checkinheritance
alert(studentinstanceofPerson);//true
alert(studentinstanceofStudent);//true
希望本文所述对大家的javascript程序设计有所帮助。