javascript - 使用 for 循环捕获 javascript 中的无效输入，否则并提示

Question

我似乎无法理解为什么我的代码无法正常工作。我想要做的是在用户输入不在我的数组中的数据时捕获错误。

 var userPrompt = prompt("Enter which car you like: ");
 var cars = ["Ferrari", "Ford", "Bugatti", "Toyota", "Honda", "Jaguar"];

 for (var x = 0; x < cars.length; x++) {
     console.log(cars[x]);
     if (cars[x] === userPrompt) {
         break;
     } else {
         console.log("err");
         break;
     }
 }

Answer 1

我会将代码重写为:

var userPrompt=prompt("Enter which car you like: ");
var cars=["Ferrari","Ford","Bugatti","Toyota","Honda","Jaguar"];
var x = cars.indexOf(userPrompt);