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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://cdn.jsdelivr.net/npm/vue@2.5.2/dist/vue.js"></script>
    <title>Document</title>
</head>
<body>
    <div id="app">
        <div v-if="show">YES</div>
        <button @click="toggleShow">Toggle</button>
    </div>
 
    <script>
        new Vue ({
            el: '#app',
            data :{
                show: true
            },
            methods:{
                toggleShow(){
                    this.show = !this.show;
                }
            }
        });
    </script>
</body>
</html>
cs


2. 버튼클릭시 여러개 그룹으로 보이게 안보이게 하기


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<body>
    <div id="app">
        <template v-if="show">
            <div>1</div>
            <div>2</div>
            <div>3</div>
        </template>
        
        <div v-else>No</div>
        <button @click="toggleShow">Toggle</button>
    </div>
 
    <script>
        new Vue ({
            el: '#app',
            data :{
                show: true
            },
            methods:{
                toggleShow(){
                    this.show = !this.show;
                }
            }
        });
    </script>
</body>
cs


v-else 는 show : false 일때 보여준다.


3. v-if, v-else-if, v-else


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<body>
    <div id="app">
        <template v-if="number === 1">
            <div>1</div>
            <div>2</div>
            <div>3</div>
        </template>
 
        <div v-else-if="number === 2">Hi</div>
 
        <div v-else>No</div>
        <button @click="increaseNumber">Increase</button>{{ number }}
    </div>
 
    <script>
        new Vue ({
            el: '#app',
            data :{
                number: 1
            },
            methods:{
                increaseNumber(){
                    this.number++;
                }
            }
        });
    </script>
</body>
cs


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