Question

我是JavaScript新手并尽我所能，所以请耐心等待我。我正在使用if else语句提出两个问题。

你居住的地方;
你在家多少小时。

根据答案house或apartment以及不到5小时的时间长短，他推荐一只宠物。

我遇到的问题是如果我输入房子和＆gt; 5小时它还返回＆gt;公寓的选择。 5个小时。

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。谢谢你的帮助。

Answer 1

存在轻微的逻辑问题：

residence == "House" || "house"

正在评估两个表达式

1：residence == "House"

2）"house"

"house"就是所谓的真理，意思是在测试时它将评估为真。因此，每当您调用此代码或其公寓对应时，它都会评估为真。

你应该写的是residence == "House" || residence == "house"。但是，有一种更清晰的方法可以解决这个问题：

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")

}

如果陈述混合在一起

1 个答案: