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。