取消按钮不适用于确认窗口

Question

我正在尝试验证JavaScript中的单选按钮，这是我的代码：

if (document.ExamEntry.GCSE.checked == true) {
    confirm("You have selected GCSE. Is this correct?");
}
if (document.ExamEntry.AS.checked == true) {
    confirm("You have selected AS. Is this correct?");
}
if (document.ExamEntry.A2.checked == true) {
    confirm("You have selected A2. Is this correct?");
}

出现确认窗口，然后单击“提交”成功将您带到下一页，但是“取消”按钮似乎不起作用-当我希望它停留在页面上时，它会将您带到下一页，以便您可以进行更改您的选择。

我已经尝试过诸如返回结果之类的事情； 结果=假

它们要么不起作用，要么不起作用，反之亦然，这样取消按钮就可以停留在同一页面上，但是提交按钮也会发生这种情况。

Answer 1

查阅有关确认的文档。 它说，

结果是一个布尔值，指示是选择“确定”还是“取消”（true表示确定）

这意味着您的每一行都应检查返回值。 一种简洁的方法是，例如：

if (!confirm("You have selected A2. Is this correct?")) {
    // event.cancel = true, or whatever you need to do on your side to cancel
} // otherwise fall through and do what you're doing.

因为它是现在，因为你从来不看的返回值confirm ，所以你总是通过落到你的“成功”的情况。

Answer 2

var gcse = true, 
    as   = true,
    a2   = true;

if (document.ExamEntry.GCSE.checked == true) {
    gcse = confirm("You have selected GCSE. Is this correct?"));
}

if (document.ExamEntry.AS.checked == true) {
    as = confirm("You have selected AS. Is this correct?");
}

if (document.ExamEntry.A2.checked == true) {
    a2 = confirm("You have selected A2. Is this correct?");
}

if (gcse && as && a2) {
    // you're golden
    window.location.href = 'otherpage'
}

Answer 3

if (document.ExamEntry.GCSE.checked == true) { 
    if(confirm("You have selected GCSE. Is this correct?")) {
        // do something
    }
} if (document.ExamEntry.AS.checked == true) {
    if(confirm("You have selected AS. Is this correct?")) {
        // do something
    }
}  
if (document.ExamEntry.A2.checked == true) {
    if(confirm("You have selected A2. Is this correct?")) {
        //do something
    }
}