Javascript 调用函数时未定义，但它没有'；不要每次打电话都这样

我正在使用codecademy学习JS，这个函数调用会得到断断续续的结果。在某些情况下，它会正确显示，但如果我继续重新运行该程序，它将在调用的天数内输出未定义。我做错了什么

詹姆斯的项目是：5公里

詹姆斯的训练时间是：未定义的天数

const getRandomEvent = () => {
let random = Math.floor(Math.random() * 3)

if(random === 0){
    return "a 5K"
}
else if(random === 1){
    return "Cycling"
}
else if(random === 2)
   return "Marathon"
}

const getTrainingDays = event =>{
let days;

if(event === "5K"){
    days = 60;
}
else if(event === "Cycling"){
    days = 40;
}
else if(event === "Marathon"){
    days = 250;
}

return days;
}

const event = getRandomEvent();
const days = getTrainingDays(event);

const event2 = getRandomEvent();
const days2 = getTrainingDays(event2);

const event3 = getRandomEvent();
const days3 = getTrainingDays(event3);

const logEvent = (name, event) => console.log(`${name}'s event is: ${event}`);
const logTime = (name, days) => console.log(`${name}'s training time is: ${days} days`);

logEvent("James", event);
logTime("James", days);

logEvent("Cleopatra", event2);
logTime("Cleopatra", days2);

logEvent("Frederick", event3);
logTime("Frederick", days3);

克利奥帕特拉的活动是：骑自行车

克利奥帕特拉的训练时间是：40天

弗雷德里克的项目是：5公里

弗雷德里克的训练时间是：未定义的天数

const getRandomEvent = () => {
let random = Math.floor(Math.random() * 3)

if(random === 0){
    return "a 5K"
}
else if(random === 1){
    return "Cycling"
}
else if(random === 2)
   return "Marathon"
}

const getTrainingDays = event =>{
let days;

if(event === "5K"){
    days = 60;
}
else if(event === "Cycling"){
    days = 40;
}
else if(event === "Marathon"){
    days = 250;
}

return days;
}

const event = getRandomEvent();
const days = getTrainingDays(event);

const event2 = getRandomEvent();
const days2 = getTrainingDays(event2);

const event3 = getRandomEvent();
const days3 = getTrainingDays(event3);

const logEvent = (name, event) => console.log(`${name}'s event is: ${event}`);
const logTime = (name, days) => console.log(`${name}'s training time is: ${days} days`);

logEvent("James", event);
logTime("James", days);

logEvent("Cleopatra", event2);
logTime("Cleopatra", days2);

logEvent("Frederick", event3);
logTime("Frederick", days3);

---

获取事件的函数将为

random==0

返回

5K

，但

getTrainingDays

检查

事件===5K

修复脚本以检查事件

5K

在适当的情况下，还应该包括catch all-else语句

考虑如下情况：

const getRandomEvent = () => {
    let random = Math.floor(Math.random() * 3);
    if (random === 0) { 
        return "a 5K"
    } else if (random === 1) {
        return "Cycling"
    } else if(random === 2) { 
        return "Marathon"
    }
}

const getTrainingDays = event => {
    let days; 
    if (event === "a 5K") { 
        days = 60; 
    } else if (event === "Cycling") {
        days = 40; 
    } else if (event === "Marathon") {
        days = 250;
    } else {
        days = -1;
    }
    return days;
}

---

因为

“一个5K”！==“5K”

，所以

事件===“5K”

从来都不是

真的
。我在这里做了一个愚蠢的更改，让我重新检查了30分钟的代码：|。谢谢你的帮助