javascript - if 语句混合在一起

Question

我对 JavaScript 很陌生，并且正在尽我所能，所以请耐心等待。我使用 if else 语句来问两个问题。

1. 您居住的地方；
2. 您在家工作了多少小时。

根据答案房子或公寓，以及少于5小时的时间，他推荐宠物。

我遇到的问题是，如果我输入 house 且 > 5 小时，它还会返回 > 5 小时的公寓选择。

这是我的代码:

var residence = prompt("Enter House, Apartment or Dorm");
var hours = prompt("Amount of hours home", "");

if ((residence == "House" || "house") && (hours <= 5)) {

    var x=window.confirm("You should get a hamster" + "\nWould you like to Purchase one?")
    if (x)
        window.alert("Thank you for your purchase!")
    else
        window.alert("Too bad")
} 
else if ((residence == "House" || "house") && (hours > 5) && (hours <= 10)) {

    var x = window.confirm("You should get a cat" + "\nWould you like to Purchase one?")
    if (x)
        window.alert("Thank you for your purchase!")
    else
        window.alert("Too bad")
}

if ((residence == "Apartment" || "apartment") && (hours <= 5)) {

    var x = window.confirm("You should get a gold fish" + "\nWould you like to Purchase one?")
    if (x)
        window.alert("Thank you for your purchase!")
    else
        window.alert("Too bad")
}

我希望这对我的要求有意义。感谢您的帮助。

Answer 1

有一个轻微的逻辑问题:

residence == "House" || "house"

正在计算两个表达式

1:住宅==“房子”

2) “房子”

"house" 就是所谓的“truthy”，这意味着在测试时它将评估为 true。因此，每次调用此代码或其对应的公寓代码时，它都会评估 true。

你应该写的是residence == "House"||住所==“房子”。然而，有一种更简洁的方法来处理这个问题:

residence.toLowerCase() == "house"

您的新代码将如下所示:

var residence = prompt("Enter House, Apartment or Dorm");
var hours = prompt("Amount of hours home", "");

if (residence.toLowerCase() == "house" && (hours <= 5)) {

    var x=window.confirm("You should get a hamster" + "\nWould you like to Purchase one?")
    if (x)
        window.alert("Thank you for your purchase!")
    else
        window.alert("Too bad")

} 
else if (residence.toLowerCase() == "house" && (hours > 5) && (hours <= 10)) {

    var x = window.confirm("You should get a cat" + "\nWould you like to Purchase one?")
    if (x)
        window.alert("Thank you for your purchase!")
    else
        window.alert("Too bad")

}
else if (residence.toLowerCase() == "apartment" && (hours <= 5)) {

    var x = window.confirm("You should get a gold fish" + "\nWould you like to Purchase one?")
    if (x)
        window.alert("Thank you for your purchase!")
    else
        window.alert("Too bad")

}