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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="http://cdnjs.cloudflare.com/ajax/libs/vue/1.0.26/vue.min.js"></script>
<style type="text/css">
.box{
width: 100px;
height: 100px;
background-color: #0a0;
}
.red{
background-color: #a00;
}
</style>
</head>
<body>
<div id="app">
<input type="checkbox" v-model="addClass" >
<div class="{{addClass? 'red' : ''}} box"></div>
</div>
<script type="text/javascript">
var vm = new Vue({
el: "#app",
data:{
addClass:false,
}
})
</script>
</body>
</html>
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