Question

我对javascript很新，我正在尝试制作一些允许人们访问我喜欢的内容的信息。例如MLP或HoO，但是如果条件似乎在第一个之后被忽略，那么我的其他如果。

var infoChoice = prompt("MLP, PJ&tO, or HoO?")
if (infoChoice != "MLP") {
    if (infoChoice != "PJ&tO") {
        if (infoChoice != "HoO") {
            confirm(infoChoice + " is not a valid option.")
        }
    }
} else if (infoChoice = "MLP") {
    confirm("MLP stands for My Little Pony. The 4th generation of MLP, known as MLP:FIM, (My Little Pony: Friendship is Magic) is by far the most well-known and beloved generation.")
} else if (infoChoice = "HoO") {
    confirm(infoChoice + " has been registered successfully.")
}

当我运行它并搜索MLP时，它确实很好，但任何其他＆＃34;有效＆＃34;选项不起作用。请帮助，这非常令人沮丧。

Answer 1

错误是：

if (infoChoice = "MLP")

应该是：

else if (infoChoice == "MLP")

else if (infoChoice == "HoO")

您在此处比较值，而不是分配

Answer 2

如果您的可能性有限，请使用switch声明：

switch(prompt("MLP, PJ&tO, or HoO?").toLowerCase()) {
case "mlp":
    alert("MLP stands for My Little Pony. The 4th generation of MLP, known as MLP:FIM, (My Little Pony: Friendship is Magic) is by far the most well-known and beloved generation.");
    break;
case "hoo":
    alert(infoChoice + " has been registered successfully.");
    break;
case "pj&to":
    // do something?
    break;
default:
    alert("That is not a valid option.");
}

Answer 3

我的java有点生疏，但我想尝试else if (infoChoice.equals("MLP")) 而不是使用==运算符。原因是==是参考比较器，而.equals则比较值。

查看此How do I compare strings in Java?

否则如果条件被忽略？

3 个答案: