javascript - JavaScript 和编程新手。我的代码有错误吗？

Question

嗨，我是 JavaScript 和一般编程的新手。我一直在使用 Codecademy 来帮助我学习。但是，我最近在 Codecademy 中创建的一组代码遇到了问题，但我似乎找不到问题所在。代码如下:

var mInQuestion = prompt('Do you play a musical instrument?').toLowerCase;
if (mInQuestion == yes) {
var musInstrument = prompt('Which instrument do you play?').toLowerCase;
switch (musInstrument) {
    case 'piano':
        console.log('Oh great! Piano is wonderful!');
        break;
    case 'guitar':
        console.log('Wow I love guitar as well!');
        experience = prompt('Did you play when you were little?').toLowerCase;
        interest = prompt('And do you like playing it?')toLowerCase;
        if (experience && interest == yes||y) {
            console.log("That's great! You must be a guitar master!");
        }
        else {
            console.log("Keep learning! It will be great. Or you could do piano?");
        }
        break;
    case 'flute':
        console.log('Oh that\'s cool! You know I used to play flute as well!');
        break;
    default:
        console.log('Oh I\'m not sure I\'ve heard of that instrument...sorry');
        break;
}
else if (mInQuestion == no) {
console.log('Oh you don\'t? You should pick one like the piano or the guitar!');
}
else {
console.log('Your answer doesn\'t make sense...');
}

Answer 1

看这里的这一行:

if (mInQuestion == yes) {

您试图检查mInQuestion是否是字符串“yes”，但实际上您正在检查它是否等于变量yes 不存在。在 yes 和 no 两边加引号。

另请注意这一行:

if (experience && interest == yes||y) {

您不能像这样检查多个条件，每次检查都必须明确:

if ((experience == 'yes' || experience == 'y') && (interest == 'yes' || interest == 'y'))

此外，您尝试调用 toLowerCase 的任何地方都是不正确的。您试图调用一个函数，但省略了括号。这意味着您的变量实际上是函数，而不是您想要的字符串。每次调用 toLowerCase

后添加括号