function?person(firstname,lastname,age,eyecolor){ ????this.firstname=firstname; ????this.lastname=lastname; ????this.age=age; ????this.eyecolor=eyecolor; ????this.changeName=changeName; function?changeName(name){ this.lastname=name; } } myMother=new?person("Sally","Rally",48,"green"); myMother.changeName("Doe"); document.write(myMother.lastname);下面代碼中，如果說this指向調用它的函數，那么下面的this不是指向changeName.那么changeName.lastname不是undifined么。 function?changeName(name){ this.lastname=name; }