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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
​
  <div id="app">
    
    <!-- 方法1：直接寫 -->
    <div class="box" 
      :class="{ 'rotate': isTransform, 'bg-orange':  boxColor }">
      Style
    </div>
    
    <!-- 方法2：物件 -->
    <div class="box" :class="objectClass">
      Object
    </div>
​
  </div>
  
  
  
  <!-- development version, includes helpful console warnings -->
  <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</body>
</html>
 
.box {
  width: 100px;
  height: 100px;
  border: 1px solid blue;
  margin-bottom: 4rem;
  font-size: 32px;
  text-align: center;
}
​
​
.rotate {
  transform: rotate(90deg);
}
​
.bg-orange {
  background: orange;
}
 
new Vue({
  el: '#app',
  data: {
    isTransform: true,
    boxColor: true,
    objectClass: {
    'rotate': true,
    'bg-orange': true,
    },
  },
});
Output

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