对象＃<person>没有方法'carName'

Question

所以我得到这个错误;对象＃没有方法'carName' 但我清楚地做到了。 Pastebin

我也试图与

player.car.model 

参考汽车的“模式”属性，但不工作，我得到一个类型错误。有任何想法吗？你需要更多信息吗？

function person(name, car) { 
    this.name = name; 
    this.car = car; 
    function carName() { 
     return car.model; 
    } 
} 

var player = new person("Name", mustang); 
var bot = new person("Bot", mustang); 
var bot2 = new person("Bot 2", mustang); 

function makeCar(company, model, maxMPH, tireSize, zeroToSixty) { 
    this.company = company; 
    this.model = model; 
    this.maxMPH = maxMPH; 
    this.tireSize = tireSize; 
    this.zeroToSixty = zeroToSixty; 
} 

var mustang = new makeCar("Ford", "Mustang GT", 105, 22, 8); 
var nissan = new makeCar("Nissan", "Nissan 360z", 100, 19, 6); 
var toyota = new makeCar("Toyota", "Toyota brandname", 95, 21, 7); 

Answer 1

它没有方法。它有一个对构造函数的变量作用域是局部的函数。

为了让每个对象的功能，将其指定为一个属性...

function person(name, car) { 
    this.name = name; 
    this.car = car; 
    this.carName = function() { 
     return this.car.model; 
    }; 
} 

或者更好，把它放在构造函数的prototype ...

function person(name, car) { 
    this.name = name; 
    this.car = car; 
} 

person.prototype.carName = function() { 
    return this.car.model; 
}; 

而且，mustang在将它传递给构造函数person时未初始化。