我正在尝试创建一个基于文本的虚拟宠物护理游戏。我希望能够为您提供两个宠物(具有属性的对象)和通过修改对象属性与这些对象进行交互的函数。这就是我所拥有的:
function Pet(pet_name){
this.pet_name = pet_name;
this.pet_hunger = Math.floor((Math.random() * 10) + 1);
this.pet_health = Math.floor((Math.random() * 10) + 1);
this.pet_happiness = Math.floor((Math.random() * 10) + 1);
this.feed = feed;
this.show = show;
}
pet1 = new Pet("Brian");
pet2 = new Pet("Lassy");
function feed(){
var amount = Math.floor((Math.random() *2) + 1);
this.pet_hunger = this.pet_hunger - amount;
if (this.pet_hunger < 0){
this.pet_hunger = 0;
}
this.show();
}
function show(){
var the_string = "";
if (this.pet_health === 0){
the_string = this.pet_name + " is dead!";
}
else {
the_string += "Name: " + this.pet_name;
the_string += "Hunger: " + this.pet_name;
the_string += "Health: " + this.pet_health;
the_string += "Happiness: " + this.pet_happinesss;
}
}
当我运行代码时:
console.log(pet1);
console.log(pet1.feed());
console.log(pet1);
我收到以下信息:
{ pet_name: 'Brian',
pet_hunger: 4,
pet_health: 4,
pet_happiness: 10,
feed: [Function: feed],
show: [Function: show] }
undefined
{ pet_name: 'Brian',
pet_hunger: 2,
pet_health: 4,
pet_happiness: 10,
feed: [Function: feed],
show: [Function: show] }
因此我们可以看到 feed
功能正在运行。但是,我仍然不确定为什么显示未定义。现在,我创建了一个名为 show
的函数。这应该整齐地显示四个人的统计数据(姓名、饥饿、健康、幸福)。但是,当我尝试运行时:
console.log(pet1.show);
console.log(pet1.feed());
console.log(pet1);
我收到以下信息:
[Function: show]
undefined
{ pet_name: 'Brian',
pet_hunger: 4,
pet_health: 1,
pet_happiness: 9,
feed: [Function: feed],
show: [Function: show] }
我不确定为什么我的 show
功能不起作用。我真的只是希望我的控制台能够清晰地显示:姓名:饥饿:健康:幸福:大家有什么想法吗?
最佳答案
您会得到未定义
,因为当您执行代码时,浏览器将记录函数的返回值。由于您没有指定返回
,因此函数返回undefined
,这就是控制台记录的内容。
如果您想在 show
函数中返回该字符串,则必须...好吧,返回该字符串:
// ...
function feed(){
var amount = Math.floor((Math.random() *2) + 1);
this.pet_hunger = this.pet_hunger - amount;
if (this.pet_hunger < 0){
this.pet_hunger = 0;
}
return this.show();
}
function show(){
var the_string = "";
if (this.pet_health === 0){
the_string = this.pet_name + " is dead!";
}
else {
the_string += "Name: " + this.pet_name + ", ";
the_string += "Hunger: " + this.pet_hunger + ", ";
the_string += "Health: " + this.pet_health + ", ";
the_string += "Happiness: " + this.pet_happiness;
}
return the_string;
}
console.log(pet1.show());
// Logs 'Name: a, Hunger: b, Health: c, Happiness: d'
你也有一些拼写错误(在更正之前,你的宠物的幸福是undefined
,哈哈),所以我更正了它们,并用逗号分隔了字符串中的每个属性,你可以更改它。
关于基于 JavaScript 文本的宠物游戏,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30043573/