Question

我对此有点新意，但我正在尝试编写一些javascript代码并遇到一些麻烦。

我有以下代码并反复检查过，无法找到问题。我通过jsfiddle运行它，我无法弄清楚我哪里出错了。

var question = prompt('Who shot Abraham Lincoln?');
if (question == 'john wilkes booth' || question == 'John Booth' || question == 'John Wilkes Booth') {
    alert("That\'s Right!");
    window.location.href = 'q2.html';
} else {
    alert('Sorry, that\'s not right.');
    alert('Please try again');
    history.refresh();
}

Answer 1

这是因为行3和5中的分号会起作用：

    var question = prompt('Who shot Abraham Lincoln?');
    if (question == 'john wilkes booth' || question == 'John Booth' || question ==
        'John Wilkes Booth') {
        alert("That\'s Right!"); window.location.href = 'q2.html';
    } else 
    {
        alert("Sorry, that\'s not right.");
        alert('Please try again');
        history.refresh();
    }

Answer 2

你得到了额外的分号＆＃39 ;;＆＃39;在问题示例的第3行中。在你提供的jsFiddle中，还有一个额外的分号

Answer 3

您可以使用开关/案例：

var question = prompt('Who shot Abraham Lincoln?');
switch (question) {
    case 'john wilkes booth':
    case 'John Booth':
    case 'John Wilkes Booth':
            alert("That\'s Right!"); window.location.href = 'q2.html'; break;
    default:
            alert("Sorry, that\'s not right.");
            alert('Please try again');
            history.refresh();
    break;
}

或者更好，我认为：

var question = prompt('Who shot Abraham Lincoln?');
if (new RegExp("john( wilkes)? booth", "gi").test(question))
{
    alert("That\'s Right!"); window.location.href = 'q2.html';
}
else 
{
    alert("Sorry, that\'s not right.");
    alert('Please try again');
    history.refresh();
}

如果else语句有多个答案

3 个答案: