정답입니다!
오답입니다!
Source
//선택자
const quizType = document.querySelector(".quiz__type"); //퀴즈종류
const quizNumber = document.querySelector(".quiz__question .number"); //퀴즈 번호
const quizAsk = document.querySelector(".quiz__question .ask"); //퀴즈 질문
const quizConfirm = document.querySelector(".quiz__answer .confirm"); //퀴즈 확인 버튼
const quizResult = document.querySelector(".quiz__answer .result"); //정답 결과
const quizView = document.querySelector(".quiz__view"); //강아지
const quizSelects = document.querySelector(".quiz__selects"); //객관식 보기
const quizChoice = quizSelects.querySelectorAll(".choice"); //객관식 보기
const quizSelect = quizSelects.querySelectorAll(".select"); //객관식 선택
//quizSelects.querySelectorAll(".select") = 퀴즈 셀렉터 안에 셀렉터를 찾게 해준다. 만약 문제가 100개 이상이 되면 보기는 400개 이상이 되기 때문에 document에서 찾는 것 보단 요소가 소속되어 있는 부모 요소를 대신 써주면 더 빠르게 찾을 수 있게 된다.
//choice와 select는 복수로 구현되어야 하기 때문에 querySelectorAll을 사용하여 모두 선택해준다.

const quizInfo = [
    {
        answerType : "웹디자인기능사 2010년 01회",
        answerNum : "1",
        answerAsk : "분신, 화신이라는 의미로 채팅, 온라인 게임 등 네크워크 환경에서 자신을 대신하여 커뮤니케이션에 참여하는 가상의 그림 또는 아이콘을 뜻하는 인터넷 용어는 무엇인가?",
        answerChoice : ["아바타", "쿠키", "포털", "허브"],
        answerResult : "1",
        answerEx : "정답은 아바타이다. 분신, 화신이라는 의미로 채팅, 온라인 게임 등 네크워크 환경에서 자신을 대신하여 커뮤니케이션에 참여하는 가상의 그림 또는 아이콘을 뜻하는 인터넷 용어를 아바타라고 한다.",
    }
]

//함수를 사용하여 각 식(출력 등)을 묶어주어서 충돌 및 오류의 가능성을 없애준다.
function updateQuiz(){
    //문제 출력
    quizType.textContent = quizInfo[0].answerType;
    quizNumber.textContent = quizInfo[0].answerNum + ". ";
    quizAsk.textContent = quizInfo[0].answerAsk;
    quizResult.textContent = quizInfo[0].answerEx;

    //객관식 보기 출력
    //for문
    //단수일 때 length를 사용하면 1번밖에 반복이 되지 않아서 오류가 난다. 때문에 배열에 맞게 인덱스를 선언해주어야 제대로 구현해주어야 한다.
    //i < quizInfo[0].answerChoice[i].length; 로 표현하면 answerChoice의 길이만큼 반복하기 때문에 오류는 나지 않는다.
    // for( let i=0; i<4; i++){
    //     quizChoice[i].textContent = quizInfo[0].answerChoice[i];
    // }

    //forEach문
    quizChoice.forEach(function (e, i){
        quizChoice[i].textContent = quizInfo[0].answerChoice[i];
    });

    // 해설 숨기기
    quizResult.style.display = "none";
    
}
updateQuiz();

//정답 확인
function answerQuiz(){
//사용자가 선택한 정답이 문제정답과 같은지 확인하기 (사용자답 == 문제 정답)
//사용자가 클릭한 input --> css의 checked 속성을 선택하여 확인할 수 있다.

    for( let i=0; i<quizSelect.length; i++){
        if(quizSelect[i].checked == true){ //보기에 체크가 되어있는 상태일 경우 
            //체크된 번호와 정답 번호가 같을 경우 true
            if(quizSelect[i].value == quizInfo[0].answerResult){
                // alert("정답");
                quizView.classList.add("like");
            } else {
                // alert("오답");
                quizView.classList.add("dislike");
                quizResult.style.display = "block";
                quizConfirm.style.display = "none";
            }
        } else {
            // alert("정답을 체크하지 않았습니다!"); - 다음예제에서 사용
        }
    }
}
quizConfirm.addEventListener("click", answerQuiz);
//addEventListener("click", function(){});에서 함수 안에 answerQuiz를 적으면 위에 함수로 작성한 answerQuiz를 불러오는 것과 같다.
//사용자가 클릭하면 answerQuiz이라는 함수가 실행되도록 한다.
<main id="main">
    <div class="quiz__wrap">
        <div class="quiz">
            <span class="quiz__type"></span>
            <h2 class="quiz__question">
                <span class="number"></span>
                <div class="ask"></div>
            </h2>
            <div class="quiz__view">
                <div class="true">정답입니다!</div>
                <div class="false">오답입니다!</div>
                <div class="dog">
                    <div class="head">
                        <div class="ears"></div>
                        <div class="face"></div>
                        <div class="eyes">
                            <div class="teardrop"></div>
                        </div>
                        <div class="nose"></div>
                        <div class="mouth">
                            <div class="tongue"></div>
                        </div>
                        <div class="chin"></div>
                    </div>
                    <div class="body">
                        <div class="tail"></div>
                        <div class="legs"></div>
                    </div>
                </div>
            </div>
            <div class="quiz__answer">
                <div class="quiz__selects">
                    <label for="select1"> 
                        <input type="radio" id="select1" class="select" name="select" value="1">
                        <span class="choice"></span>
                    </label>
                    <!-- 1 -->

                    <label for="select2">
                        <input type="radio" id="select2" class="select" name="select" value="2">
                        <span class="choice"></span>
                    </label>
                    <!-- 2 -->
                    
                    <label for="select3">
                        <input type="radio" id="select3" class="select" name="select" value="3">
                        <span class="choice"></span>
                    </label>
                    <!-- 3 -->
                    
                    <label for="select4">
                        <input type="radio" id="select4" class="select" name="select" value="4">
                        <span class="choice"></span>
                    </label>
                    <!-- 4 -->
                </div>

                <button class="confirm">정답 확인하기</button>
                <div class="result"></div>
            </div>
        </div>
        <!-- quiz01 -->

    </div>
</main>
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

*:before,
*:after {
    box-sizing: border-box;
}

a {
    text-decoration: none;
}

body {
    background-color: #f6f6f6;
    background-image:
        linear-gradient(90deg, #cdcccc 0px, #cdcccc 1px, transparent 1px, transparent 99px, transparent 100px),
        linear-gradient(#cdcccc 0px, #cdcccc 1px, transparent 1px, transparent 99px, transparent 100px),
        linear-gradient(#e0e0e0 0px, #e0e0e0 1px, transparent 1px, transparent 99px, transparent 100px),
        linear-gradient(90deg, #e0e0e0 0px, #e0e0e0 1px, transparent 1px, transparent 99px, transparent 100px),
        linear-gradient(transparent 0px, transparent 5px, #f6f6f6 5px, #f6f6f6 95px, transparent 95px, transparent 100px),
        linear-gradient(90deg, #e0e0e0 0px, #e0e0e0 1px, transparent 1px, transparent 99px, #e0e0e0 99px, #e0e0e0 100px),
        linear-gradient(90deg, transparent 0px, transparent 5px, #f6f6f6 5px, #f6f6f6 95px, transparent 95px, transparent 100px),
        linear-gradient(transparent 0px, transparent 1px, #f6f6f6 1px, #f6f6f6 99px, transparent 99px, transparent 100px),
        linear-gradient(#cdcccc, #cdcccc);
    background-size: 100px 100%, 100% 100px, 100% 10px, 10px 100%, 100% 100px, 100px 100%, 100px 100%, 100px 100px, 100px 100px;
}

#header {
    background: #262626;
    color: #fff;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    position: relative;
    z-index: 10;
    /*포지션 앱솔루트 속성을 줄 때는 기준점을 꼭 설정해주어야 한다.*/
}

#header::before {
    content: "";
    border: 4px ridge #A3A3A3;
    position: absolute;
    left: 5px;
    top: 5px;
    width: calc(100% - 10px);
    height: calc(100% - 10px);
    box-sizing: border-box;
    z-index: -1;
}

#header h1 {
    padding: 3px 3px 5px 10px;
    font-family: "DungGeunMo";
    font-size: 30px;
}

#header h1 a {
    color: #CB7A1D
}

#header h1 em {
    font-size: 16px;
    font-style: normal;
}

@media (max-width: 600px) {
    #header h1 em {
        display: none;
    }
}

#header nav {
    padding-right: 10px;
}

#header nav li {
    display: inline;
}

#header nav li a {
    color: #fff;
    padding: 0 10px;
    border: 1px dashed #fff;
    font-family: "DungGeunMo";
}

#header nav li.active a {
    color: #000;
    background: #fff;
}

#footer {
    background: #fff;
    text-align: center;
    padding: 20px;
    width: 100%;
    box-sizing: border-box;
    margin-top: 150px;
    position: fixed;
    left: 0;
    bottom: 0;
    z-index: 10000;
}

#footer a {
    color: #000;
    font-family: "DungGeunMo";
}

#footer a:hover {
    text-decoration: underline;
}

/*  quiz__wrap */
.quiz__wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 50px;
    margin-bottom: 150px;
    flex-wrap: wrap;
    align-items: flex-start;
}

.quiz {
    max-width: 500px;
    width: 100%;
    background-color: #fff;
    border: 8px ridge #cacaca;
    margin: 10px;
}

.quiz__type {
    background-color: #cacaca;
    text-align: center;
    display: block;
    font-size: 16px;
    border: 3px ridge #cacaca;
    color: #3b3b3b;
    font-family: "DungGeunMo";
    padding: 4px;
}

.quiz__question {
    border-top: 6px ridge #cacaca;
    border-bottom: 6px ridge #cacaca;
    padding: 13px 30px;
    font-family: "Cafe24Danjunghae";
    line-height: 1.3;
}

.quiz__question .number {
    color: rgb(255, 135, 7);
}

.quiz__question .ask {
    display: inline;
}

.quiz__answer {
    border-top: 6px ridge #cacaca;
    padding: 10px;
    background-color: #f5f5f5;
}

.quiz__answer .input {
    width: 100%;
    border: 6px ridge #cacaca;
    font-size: 22px;
    padding: 13px 20px;
    background-color: #fff;
    font-family: "Cafe24Danjunghae";
    margin-bottom: 10px;
    box-sizing: border-box;
}

.quiz__answer .confirm {
    border: 6px ridge #cacaca;
    width: 100%;
    font-size: 22px;
    padding: 13px 20px;
    background-color: #d6d6d6;
    font-family: "Cafe24Danjunghae";
    cursor: pointer;
}

.quiz__answer .result {
    width: 100%;
    font-size: 22px;
    padding: 13px 20px;
    border: 6px ridge #cacaca;
    box-sizing: border-box;
    text-align: center;
    font-family: "Cafe24Danjunghae";
}

.quiz__view {
    background-color: #f5f5f5;
    font-family: "Cafe24Danjunghae";
    position: relative;
    overflow: hidden;
}

.quiz__view .true {
    width: 120px;
    height: 120px;
    line-height: 120px;
    /*한 줄 일 때 가운데로 오게해줌*/
    background-color: #eaa000;
    color: #fff;
    border-radius: 50%;
    text-align: center;
    position: absolute;
    left: 70%;
    top: 100px;
    opacity: 0;
}

.quiz__view .false {
    width: 120px;
    height: 120px;
    line-height: 120px;
    background-color: rgb(126, 48, 48);
    color: #fff;
    border-radius: 50%;
    text-align: center;
    position: absolute;
    right: 70%;
    top: 100px;
    opacity: 0;
}

.quiz__view.like .true {
    opacity: 1;
    animation: wobble 0.6s;
}

.quiz__view.dislike .false {
    opacity: 1;
    animation: wobble 0.6s;
}

.quiz__selects {
    margin: 5px 0;
}

.quiz__selects label {
    display: flex;
}

.quiz__selects label input {
    position: absolute;
    left: -9999px;
}

.quiz__selects label span {
    font-size: 20px;
    line-height: 1.3;
    font-family: "Cafe24Danjunghae";
    padding: 10px;
    display: flex;
    align-items: center;
    width: 100%;
    border-radius: 10px;
    cursor: pointer;
}

.quiz__selects label span::before {
    content: '';
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: #fff;
    margin-right: 15px;
    display: flex;
    flex-shrink: 0; 
    box-shadow: inset 0px 0px 0px 4px #ffae00;
    transition: all 0.25s;
}

.quiz__selects label input:checked + span {
    background-color: #e2e1de;
} 
/* input박스를 checked 한 상태일 때 스타일이 나타나도록 함. */
/* 즉 input이 checked일 때 형제인 span과 함께 스타일을 적용시키는 것. */

.quiz__selects label input:checked + span::before {
    box-shadow: inset 0px 0px 0px 10px #ffae00;
}

.quiz__confirm {
    width: 100%;
    text-align: center;
}
.quiz__confirm .check {
    font-size: 22px;
    line-height: 1.3;
    padding: 13px 60px;
    border: 6px ridge #cacaca;
    box-sizing: border-box;
    text-align: center;
    font-family: "Cafe24Danjunghae";
    cursor: pointer;
    margin: 40px 0;
    transition: background 0.3s;
}
.quiz__confirm .check:hover {
    background-color: #fec32e56;
}


@keyframes wobble {
    0% {
        transform: translateX(0) rotate(0deg);
    }

    15% {
        transform: translateX(-25%) rotate(-5deg);
    }

    30% {
        transform: translateX(20%) rotate(3deg);
    }

    45% {
        transform: translateX(-15%) rotate(-3deg);
    }

    60% {
        transform: translateX(10%) rotate(2deg);
    }

    75% {
        transform: translateX(-5%) rotate(-1deg);
    }

    100% {
        transform: translateX(0) rotate(0deg);
    }
}

/* dog */
.dog .tail,
.dog .chin,
.dog .tongue::before,
.dog .tongue::after,
.dog .mouth,
.dog .nose,
.dog .teardrop,
.dog .eyes,
.dog .face::before,
.dog .face::after,
.dog .ears::before,
.dog .ears::after {
    transition: 0.2s ease-in;
}

.dog {
    padding-top: 50px;
}

.dog .head,
.dog .body {
    position: relative;
    width: 115px;
}

.dog .head {
    height: 115px;
    border-radius: 50% 50% 0 0;
    margin: 0 auto;
}

.dog .ears {
    position: relative;
    top: -14%;
    width: 100%;
}

.dog .ears::before,
.dog .ears::after {
    content: "";
    position: absolute;
    top: 0;
    width: 35px;
    height: 70px;
    background: #CB7A1D;
    border-top: 11px solid #F7AA2B;
    border-left: 7px solid #F7AA2B;
    border-right: 7px solid #F7AA2B;
}

.dog .ears::before {
    left: 0;
    border-radius: 50% 45% 0 0;
}

.dog .ears::after {
    right: 0;
    border-radius: 45% 50% 0 0;
}

.dog .face {
    position: absolute;
    background: #F7AA2B;
    width: 100%;
    height: 100%;
    border-radius: 50% 50% 0 0;
}

.dog .face::before,
.dog .face::after {
    content: "";
    display: block;
    margin: auto;
    background: #FEFEFE;
}

.dog .face::before {
    width: 15px;
    height: 35px;
    margin-top: 24px;
    border-radius: 20px 20px 0 0;
}

.dog .face::after {
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    width: 60px;
    height: 65px;
    border-radius: 45% 45% 0 0;
}

.dog .eyes {
    position: relative;
    top: 29%;
    text-align: center;
}

.dog .eyes::before,
.dog .eyes::after {
    content: "";
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 100%;
    background: #451D1C;
    margin: 0 14.5%;
}

.dog .teardrop {
    position: absolute;
    top: 125%;
    left: 19%;
    width: 6px;
    height: 6px;
    border-radius: 0 50% 50% 50%;
    transform: rotate(45deg);
    background: #FEFEFE;
    visibility: hidden;
}

.dog .nose {
    position: relative;
    top: 35%;
    width: 16px;
    height: 8px;
    border-radius: 35px 35px 65px 65px;
    background: #451D1C;
    margin: auto;
}

.dog .mouth {
    position: relative;
    top: 34.5%;
    width: 4px;
    height: 6px;
    margin: 0 auto;
    text-align: center;
    background: #451D1C;
}

.dog .mouth::before,
.dog .mouth::after {
    content: "";
    position: absolute;
    top: -4px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 4px solid #451D1C;
    border-left-color: transparent;
    border-top-color: transparent;
    z-index: 2;
}

.dog .mouth::before {
    transform: translateX(-89%) rotate(45deg);
}

.dog .mouth::after {
    transform: translateX(-2px) rotate(45deg);
}

.dog .tongue {
    position: relative;
    z-index: 1;
}

.dog .tongue::before,
.dog .tongue::after {
    content: "";
    position: absolute;
}

.dog .tongue::before {
    top: 10px;
    left: -7px;
    width: 18px;
    height: 0;
    border-radius: 50%;
    background: #451D1C;
    z-index: -1;
}

.dog .tongue::after {
    top: 14px;
    left: -4px;
    width: 12px;
    height: 0;
    border-radius: 20px;
    background: #F5534F;
    z-index: 5;
}

.dog .chin {
    position: relative;
    top: 47.5%;
    margin: 0 auto;
    width: 12px;
    height: 12px;
    border-top: 10px solid #E8E7EC;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-radius: 2px;
    z-index: 0;
}

.dog .body {
    position: relative;
    height: 139px;
    margin: auto;
    z-index: 0;
}

.dog .body::before,
.dog .body::after {
    content: "";
    position: absolute;
    top: -1px;
    left: 0;
    right: 0;
    bottom: 0;
    display: block;
    width: 100%;
    margin: auto;
    background: #F7AA2B;
}

.dog .body::after {
    top: -2px;
    bottom: -1px;
    width: 60px;
    background: #FEFEFE;
}

.dog .tail {
    position: absolute;
    left: -60%;
    bottom: 1px;
    background: #F7AA2B;
    width: 93px;
    height: 15px;
    transform: rotate(45deg);
    transform-origin: 100% 50%;
    border-radius: 25px 0 0 25px;
    z-index: -2;
    animation: movetail 0.1s linear infinite alternate forwards;
}

.dog .legs {
    position: absolute;
    bottom: 0;
    left: -10%;
    width: 120%;
    height: 15%;
    background: #F7AA2B;
    border-radius: 10px 10px 0 0;
}

.dog .legs::before,
.dog .legs::after {
    content: "";
    position: absolute;
    bottom: 1px;
    background: #CB7A1D;
    z-index: -1;
}

.dog .legs::before {
    left: -7.5%;
    width: 115%;
    height: 55%;
    border-radius: 5px 5px 0 0;
}

.dog .legs::after {
    left: -3.5%;
    width: 107%;
    height: 250%;
    border-radius: 20px 20px 35px 35px;
}

.like .dog .face::before {
    margin-top: 10px;
}

.like .dog .face::after {
    height: 85px;
}

.like .dog .eyes {
    top: 13%;
}

.like .dog .eyes::before,
.like .dog .eyes::after {
    width: 18px;
    height: 5px;
    margin: 0px 12.5%;
    transform: rotate(-37.5deg);
    border-radius: 20px;
}

.like .dog .eyes::after {
    transform: rotate(37.5deg);
}

.like .dog .nose {
    top: 18%;
}

.like .dog .mouth {
    top: 16.5%;
}

.like .dog .tongue::before {
    height: 12px;
}

.like .dog .tongue::after {
    height: 24px;
    animation: movetongue 0.1s linear 0.35s infinite alternate forwards;
}

.like .dog .chin {
    top: 34%;
}

.like .dog .tail {
    animation: movetail 0.1s linear infinite alternate forwards;
}

.dislike .dog .ears::before {
    transform: rotate(-50deg) translate(-7px, 2px);
}

.dislike .dog .ears::after {
    transform: rotate(50deg) translate(7px, 2px);
}

.dislike .dog .face::before {
    margin-top: 28px;
}

.dislike .dog .face::after {
    height: 55px;
}

.dislike .dog .eyes {
    top: 38%;
}

.dislike .dog .eyes::before,
.dislike .dog .eyes::after {
    width: 18px;
    height: 5px;
    margin: 0px 14.5%;
    transform: rotate(-37.5deg);
    border-radius: 20px;
}

.dislike .dog .eyes::after {
    transform: rotate(37.5deg);
}

.dislike .dog .teardrop {
    animation: cry 0.1s ease-in 0.25s forwards;
}

.dislike .dog .nose {
    top: 44%;
}

.dislike .dog .mouth {
    top: 42%;
}

.dislike .dog .chin {
    top: 52%;
}

.dislike .dog .tail {
    transform: rotate(0);
    animation: none;
}
  

@keyframes movetongue {
    100% {
        height: 27px;
    }
}

@keyframes movetail {
    0% {
        transform: rotate(37deg);
    }

    100% {
        transform: rotate(52deg);
    }
}

@keyframes cry {
    100% {
        visibility: visible;
    }
}