# addClass() /  removeClass()

> $("선택자").addClass("class 값");
>
> $("선택자").removeClass("class 값");

### 예제

#### 버튼으로 클래스 생성/삭제

```markup
<!DOCTYPE html>
<html lang="ko">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jQuery_addClass</title>
    <style>
        @font-face {
            font-family: 'MapoGoldenPier';
            src: url('https://cdn.jsdelivr.net/gh/projectnoonnu/noonfonts_2001@1.1/MapoGoldenPierA.woff') format('woff');
            font-weight: normal;
            font-style: normal;
        }
        body {font-family: 'MapoGoldenPier';}
        li.red {color: #c7254e; background-color: #f9f2f4; border: 1px dashed #a51a3d;}
    </style>
</head>
<body>
    <h1>탐색(Traversing)</h1>
    <ul>
        <li>addClass() 메서드는 선택한 요소에 클래스를 생성하고, removeClass() 메서드는 선택한 요소에서 지정한 클래스를 삭제합니다.</li>
        <li>toggleClass() 메서드는 선택한 요소에 지정한 클래스가 없으면 생성하고, 있을 경우에는 삭제합니다.</li>
        <li>hasClass() 메서드는 선택한 요소에 지정한 클래스가 있으면 true를 반환하고, 없으면 false를 반환합니다.</li>
    </ul>
    <button class="btn1">addClass()</button>
    <button class="btn2">removeClass()</button>
    
    <!-- script -->
    <script src="jquery.min_1.12.4.js"></script>
    <script>
        // $("li:nth-child(2)").css({backgroundColor:"#f00", color:"#fff"})
        // $("li:nth-of-type(2)").css({backgroundColor:"#f00", color:"#fff"})
        // $("li:eq(1)").css({backgroundColor:"#f00", color:"#fff"})
        // $("li:contains('toggle')").css({backgroundColor:"#f00", color:"#fff"})
        // $("li:odd").css({backgroundColor:"#f00", color:"#fff"})
        // $("li:nth-child(2n)").css({backgroundColor:"#f00", color:"#fff"})
        // $("li:nth-child(even)").css({backgroundColor:"#f00", color:"#fff"})

        //click event method
        $(".btn1").click(function(){
            // $("li:nth-of-type(2)").css({backgroundColor:"#f00", color:"#fff"})
            $("li:nth-of-type(2)").addClass("red");
        });
        $(".btn2").click(function(){
            $("li:nth-of-type(2)").removeClass("red");
        });
    </script>
</body>
</html>
```

#### addClass를 이용한 탭 메뉴

{% embed url="<https://hyunseo418.github.io/dothome/jquery/jquery06_addClass2.html>" %}

```markup
<!DOCTYPE html>
<html lang="ko">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>jQuery</title>
    <style>
        * {margin: 0; padding: 0;}
        ul {list-style-type: none; }
        a {text-decoration: none; color: #fff;}
        #tab-menu {width: 500px; background: #ccc; margin: 50px auto;}
        #tab-btn ul{overflow: hidden;}
        #tab-btn li{float: left; width: 20%; text-align: center;}
        #tab-btn li a {display: block; padding: 20px; background: #1e88e5;}
        #tab-cont {width: 500px; height: 334px;}
        #tab-cont.img1 {background: url(img/img01.png) no-repeat; background-size: contain;}
        #tab-cont.img2 {background: url(img/img02.png) no-repeat; background-size: contain;}
        #tab-cont.img3 {background: url(img/img03.png) no-repeat; background-size: contain;}
        #tab-cont.img4 {background: url(img/img04.png) no-repeat; background-size: contain;}
        #tab-cont.img5 {background: url(img/img05.png) no-repeat; background-size: contain;}
    </style>
</head>
<body>
    <div id="tab-menu">
        <div id="tab-btn">
            <ul>
                <li><a href="#">Tab1</a></li>
                <li><a href="#">Tab2</a></li>
                <li><a href="#">Tab3</a></li>
                <li><a href="#">Tab4</a></li>
                <li><a href="#">Tab5</a></li>
            </ul>
        </div>
        <div id="tab-cont" class="img1"></div>
    </div>

    <!-- script -->
    <script src="jquery.min_1.12.4.js"></script>
    <script>
        //글씨를 클릭하면 경고창
        $("#tab-btn li:eq(0) a").click(function(){
            $("#tab-cont").removeClass().addClass("img1");
        });
        $("#tab-btn li:eq(1) a").click(function(){
            $("#tab-cont").removeClass().addClass("img2");
        });
        $("#tab-btn li:eq(2) a").click(function(){
            $("#tab-cont").removeClass().addClass("img3");
        });
        $("#tab-btn li:eq(3) a").click(function(){
            $("#tab-cont").removeClass().addClass("img4");
        });
        $("#tab-btn li:eq(4) a").click(function(){
            $("#tab-cont").removeClass().addClass("img5");
        });
    </script>
</body>
</html>
```


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