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：


// define the Person Class
function Person() {}
Person.prototype.walk = function(){
alert ('I am walking!');
};
Person.prototype.sayHello = function(){
alert ('hello');
};
// define the Student class
function Student() {
// Call the parent constructor
Person.call(this);
}
// inherit Person
Student.prototype = new Person();
// correct the constructor pointer because it points to Person
Student.prototype.constructor = Student;
// replace the sayHello method
Student.prototype.sayHello = function(){
alert('hi, I am a student');
}
// add sayGoodBye method
Student.prototype.sayGoodBye = function(){
alert('goodBye');
}
var student = new Student();
student.sayHello();
student.walk();
student.sayGoodBye();
// check inheritance
alert(student instanceof Person); // true
alert(student instanceof Student); // true

希望本文所述对大家的javascript程序设计有所帮助。


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