在业余时间我尝试学习一点 JS，但我还是坚持主题中的主题。
var person = new Person("Bob", "Smith", 52);
var teacher = new Teacher("Adam", "Greff", 209);
function Humans(firstName, lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
function Person(firstName, lastName, age) {
Humans.call(this, firstName, lastName);
this.age = age;
}
Person.prototype = Object.create(Humans.prototype);
Person.prototype.fullDetail = function() {
return this.firstName + " " + this.lastName + " " + this.age;
};
function Teacher(firstName, lastName, roomNumber) {
Humans.call(this, firstName, lastName);
this.room = roomNumber;
}
Teacher.prototype = Object.create(Humans.prototype);
Teacher.prototype.fullDetail = function() {
return this.firstName + " " + this.lastName + " " + this.room;
};
person.fullDetail();
谁能告诉我为什么我无法执行person.fullDetail();?
如果您能对您的代码版本发表一些评论，我将非常感激，谢谢。
因为您是在定义对象的原型之前创建对象的。
当你这样做时
var person = new Person ("Bob", "Smith", 52);
你正在根据以下内容制作一个对象current的定义Person。稍后在该代码中，您将更改原型Person完整地
Person.prototype = Object.create(Humans.prototype);
要解决此问题，请创建您的对象after您已经完成了原型的重新分配。
function Humans(firstName, lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
function Person(firstName, lastName, age) {
Humans.call(this, firstName, lastName);
this.age = age;
}
Person.prototype = Object.create(Humans.prototype);
Person.prototype.fullDetail = function() {
return this.firstName + " " + this.lastName + " " + this.age;
};
function Teacher(firstName, lastName, roomNumber) {
Humans.call(this, firstName, lastName);
this.room = roomNumber;
}
Teacher.prototype = Object.create(Humans.prototype);
Teacher.prototype.fullDetail = function() {
return this.firstName + " " + this.lastName + " " + this.room;
};
var person = new Person("Bob", "Smith", 52);
var teacher = new Teacher("Adam", "Greff", 209);
console.log(person.fullDetail());
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