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<div id="app">
  <div v-bind:style="[baseStyles, overridingStyles]">配列構文</div>
</div>

new Vue({
  el: '#app',
  data: {
    baseStyles: {
      color: 'red'
    },
    overridingStyles: {
      fontSize: '18px'
    }
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.6.10/vue.min.js"></script>