使用“jQuery”设置动画；。不是（）；

我正在用jQuery创建一个非常简单的测验应用程序。它的工作原理是你有一个问题和三个答案。点击错误答案会使点击答案的不透明度降低到60%。点击正确答案会使所有错误答案完全消失，只剩下正确答案

该页面有3个可通过导航选择的测验。因此，我使用.index（）对测试和问题进行排序，以针对手头的特定问题。这与测验的其他内容一样有效

我唯一的问题是，在选择正确答案时，其他答案会逐渐消失。现在，只有第一个问题是这样运作的；所有其他问题保持100%不透明度。我整晚都在盯着它想把它弄走，可能需要一双额外的眼睛

代码：

 $('#test .test li ol li').click(function() 
{
    if($(this).attr('class') == 'correct')
    {
        var testNum = $(this).closest('.test').index('.test');
        var qustNum = $(this).index('.correct');
        var corAns = $(this);
        var theList = $('.test:eq(' + testNum + ') li:eq(' + qustNum + ') ol li');

        //find other questions
        theList.not('.correct').animate({ opacity : 0 }, 1000);

        getAnswer(testNum, qustNum, corAns);
    }
    else 
    {
        $(this).animate({ opacity : 0.6 }, 500);
    }
});

function getAnswer(testNum, qustNum, corAns)
{
    console.log(testNum + ' : ' + qustNum + ' : ' + corAns.text());

    //get xml file with answers
    $.ajax({
        type: "GET",
        url: "answers.xml",
        dataType: "xml",
        success: function(xml) {
             $(xml).find('Answers').each(function(){
                //find the answer in the xml
                var answer = $(this).find('test:eq(' + testNum + ') answer:eq(' + qustNum + ')').text();
                console.log(answer);
                //place answer inside correct li
                corAns.html(answer);
             });
        }
    });

    //fade in next button
    $('#test span').css({ 'display' : 'block' }).delay(2000).animate({ opacity : 1 }, 1000);

    $('#test span').click(function()
    {   
        $('.test:eq(' + testNum + ')').animate({ top : '-=286px' }, 500);
    });
}

HTML:

 <section class="content" id="test">
            <h1 style="opacity:0;">test</h1>
            <h2 style="opacity:0;">How Much Do You Know?<span>(choose a test)</span></h2>

            <ul class="nav">
                <li>
                    <img src="_images/_test/test1.jpg" />
                </li>
                <li>
                    <img src="_images/_test/test2.jpg" />
                </li>
                <li>
                    <img src="_images/_test/test3.jpg" />
                </li>
            </ul>

            <ol class="test">
                <li>
                    Which blood cells carry oxygen throughout your body?
                    <ol>
                        <li>White Blood Cells</li>
                        <li class="correct">Red Blood Cells</li>
                        <li>Oxygen Cells</li>
                    </ol>
                </li>

                <li>
                    A blood test procedure can be made easier if you&#8230;
                    <ol>
                        <li class="correct">imagine you are in a comfortable place during the test.</li>
                        <li>wear something red.</li>
                        <li>don't sleep for a week before the test.</li>
                    </ol>
                </li>

                <li>
                    <p>Why do you need to have blood tests?</p>
                    <ol>
                        <li>To make sure you have blood</li>
                        <li>Because it's easier than a math test</li>
                        <li class="correct">So the doctor can check your health</li>
                    </ol>
                </li>

                <li>
                    <p>How often do you need to have a blood test?</p>
                    <ol>
                        <li>Once a year</li>
                        <li>Twice a month</li>
                        <li class="correct">It depends on your health</li>
                    </ol>
                </li>

                <li>
                    <p>How long does it take for your body to replace the blood taken from a blood test?</p>
                    <ol>
                        <li>One year</li>
                        <li class="correct">One day</li>
                        <li>One hour</li>
                    </ol>
                </li>
            </ol>

            <ol class="test">
                <li>
                    <p>How much blood is drawn in a typical blood test?</p>
                    <ol>
                        <li>About half a cup</li>
                        <li class="correct">About one teaspoon</li>
                        <li>About 1/2 gallon</li>
                    </ol>
                </li>

                <li>
                    <p>On average, about how much blood does a person have in their body?</p>
                    <ol>
                        <li class="correct">A little more then one gallon</li>
                        <li>1/2 gallon</li>
                        <li>Four gallons</li>
                    </ol>
                </li>

                <li>
                    <p>Which blood cells help your body fight infection?</p>
                    <ol>
                        <li>Army cells</li>
                        <li class="correct">White blood cells</li>
                        <li>Red blood cells</li>
                    </ol>
                </li>

                <li>
                    <p>Which cells help you stop bleeding if get a cut?</p>
                    <ol>
                        <li class="correct">Platelets</li>
                        <li>Red blood cells</li>
                        <li>Plug-up cells</li>
                    </ol>
                </li>

                <li>
                    <p>The area on your skin where blood is drawn must be cleaned because&#8230;</p>
                    <ol>
                        <li>It's always better to look clean</li>
                        <li class="correct">It is important that the blood sample is not infected</li>
                        <li>The test won't hurt as much</li>
                    </ol>
                </li>
            </ol>

            <ol class="test">
                <li>
                    <p>If you have anemia it means your blood has…</p>
                    <ol>
                        <li>too many red blood cells.</li>
                        <li class="correct">too few red blood cells.</li>
                        <li>too many white blood cells.</li>
                    </ol>
                </li>

                <li>
                    <p>About how many blood chemistry tests are preformed in the United States each year?</p>
                    <ol>
                        <li>100,000</li>
                        <li>3 million</li>
                        <li class="correct">6 billion</li>
                    </ol>
                </li>

                <li>
                    <p>Where are blood cells made?</p>
                    <ol>
                        <li>Your heart</li>
                        <li class="correct">Your bone marrow</li>
                        <li>California</li>
                    </ol>
                </li>

                <li>
                    <p>A Complete Blood Count (CBC) is a test in which…</p>
                    <ol>
                        <li class="correct">all of the different cells in your blood are counted.</li>
                        <li>a machine looks at the chemicals in your blood to check for disease.</li>
                        <li>the amount of blood in your body is counted.</li>
                    </ol>
                </li>

                <li>
                    <p>Testing for blood types is important in order to…</p>
                    <ol>
                        <li class="correct">receive the right blood type if you ever need blood.</li>
                        <li>be eligible for a drivers license.</li>
                        <li>learn about your personality.</li>
                    </ol>
                </li>
            </ol>
            <span>Next Question --></span>
        </section>

测试
你知道多少？（选择一个测试）









哪些血细胞将氧气输送到全身？
白细胞
红细胞
氧电池


如果你…；
想象您在测试期间处于一个舒适的位置
穿红色的衣服
考试前一周不要睡觉


你为什么要验血

确保你有血
因为这比数学考试容易
这样医生就可以检查你的健康了


你需要多久做一次验血

一年一次
一个月两次
这取决于你的健康状况


你的身体需要多长时间来更换血液测试中的血液

一年
一天
一小时


在一次典型的血液测试中抽取了多少血液

大约半杯
大约一茶匙
大约1/2加仑


平均来说，一个人体内有多少血液

一加仑多一点
1/2加仑
四加仑


哪些血细胞能帮助你的身体抵抗感染

军队细胞
白血球
红细胞


如果你被割伤了，哪些细胞可以帮助你止血

血小板
红细胞
堵塞电池


你皮肤上的抽血区域必须清洁，因为…

看起来干净总是好的
血液样本不受感染很重要
这次测试不会有那么大的伤害


如果你有贫血意味着你的血液

红细胞太多了
红细胞太少
白细胞过多


美国每年进行多少次血液化学测试

十万
300万
60亿


血细胞是在哪里制造的

你的心
你的骨髓
加州


全血细胞计数（CBC）是一种检测

对您血液中的所有不同细胞进行计数
var theList = $('.test:eq(' + testNum + ') li:eq(' + qustNum + ') ol li');

var theList = $('.test').eq(testNum).find('li').eq(qustNum).find('ol li');

theList.not('.correct').animate({ opacity : 0 }, 1000);

$(this).siblings().animate({ opacity : 0 }, 1000);