当使用random()时，我从不同的数组获得输出

Question

我是新来的编码，所以我有这个麻烦。

我正在尝试创造一个游戏，你可以得到一个随机的美食，从这个美食中你可以得到一个随机的餐馆为特定的美食。

然而，当我运行代码时，我最终得到了一个不同的烹饪餐厅。

let whereToEat = prompt("Shall we go out to eat today");
let choice;
let cuisines = ["Italian", "Korean", "Thai", "Mediterranean", "Turkish"];
let italianRestaurant = ["Vapiano", "Bella Italia", "Grato"];
let koreanRestaurant = ["Superstar bbq", "Bari Bari", "Korean bbq and vegan"];
let thaiRestaurant = ["Thai pot", "Wok n Roll", "Farang"];
let mediterraneanRestaurant = ["Mediterrnean cafe and restaurant", "Seabird", "Nopi"];
let turkishRestaurant = ["Gokyuzu", "Antalya restaurant", "La'De kitchen"];

function whatToEat(choices) {
let index = Math.floor(Math.random() * choices.length);
return choices[index];
};
if (whereToEat === "yes") {
alert("Great");
alert("Lets try " + whatToEat(cuisines));
if (whatToEat(cuisines) === "Italian") {
alert("Let's go here: " + whatToEat(italianRestaurant));
} else if (whatToEat(cuisines) === "Korean") {
alert("Let's go here: " + whatToEat(koreanRestaurant));
} else if (whatToEat(cuisines) === "Thai") {
alert("Let's go here: " + whatToEat(thaiRestaurant));
} else if (whatToEat(cuisines) === "Mediterranean") {
alert("Let's go here: " + whatToEat(mediterraneanRestaurant));
} else if (whatToEat(cuisines) === "Turkish") {
alert("Let's go here: " + whatToEat(turkishRestaurant));
}
} else {
alert("Ahh I was hoping you would say yes");
}

Answer 1

存储whatToEat的结果，这样您就不会在每个if语句中调用它一次。

let whereToEat = prompt("Shall we go out to eat today");
let cuisines = ["Italian", "Korean", "Thai", "Mediterranean", "Turkish"];
let italianRestaurant = ["Vapiano", "Bella Italia", "Grato"];
let koreanRestaurant = ["Superstar bbq", "Bari Bari", "Korean bbq and vegan"];
let thaiRestaurant = ["Thai pot", "Wok n Roll", "Farang"];
let mediterraneanRestaurant = ["Mediterrnean cafe and restaurant", "Seabird", "Nopi"];
let turkishRestaurant = ["Gokyuzu", "Antalya restaurant", "La'De kitchen"];

function whatToEat(choices) {
let index = Math.floor(Math.random() * choices.length);
return choices[index];
};
if (whereToEat === "yes") {
const choice = whatToEat(cuisines);
alert("Great");
alert("Lets try " + choice);
if (choice === "Italian") {
alert("Let's go here: " + whatToEat(italianRestaurant));
} else if (choice === "Korean") {
alert("Let's go here: " + whatToEat(koreanRestaurant));
} else if (choice === "Thai") {
alert("Let's go here: " + whatToEat(thaiRestaurant));
} else if (choice === "Mediterranean") {
alert("Let's go here: " + whatToEat(mediterraneanRestaurant));
} else if (choice === "Turkish") {
alert("Let's go here: " + whatToEat(turkishRestaurant));
}
} else {
alert("Ahh I was hoping you would say yes");
}

Answer 2

这是因为你在'菜系'数组上调用了两次随机的whatToEat函数，这将给你两个不同的结果。将结果存储在绑定中，这样它就不会改变:

const choice = whatToEat(cuisines);
alert("Lets try " + choice);
if (choice === "Italian") { ... etc