vue中样式的典型操作(:class,:style)

<template>
    <div class="home-wrapper">
      <div class="home-top">this is from Home.vue</div>
      <!--num>10,背景颜色红色，否则橙色-->
      <div class="test" :class="num>10? bgColor1: bgColor2">this is a test,num is : {{num}}</div>
      <button @click="changeNum">click to change num</button>
      <div class="test2" :style="{fontSize: fontSize+ 'px'}">this is test2</div>
      <button @click="changeTest2FontSize">click to change fontSize</button>
    </div>
</template>

<script>
export default {
  name: 'Home',
  data () {
    return {
      num: '',
      bgColor1: 'bgColor1',
      bgColor2: 'bgColor2',
      fontSize: 10
    }
  },
  methods: {
    changeNum () {
      this.num = Math.floor(Math.random() * 20)
      console.log(this.num)
    },
    changeTest2FontSize () {
      if (this.fontSize < 30) {
        this.fontSize = 30
      } else {
        this.fontSize = 15
      }
    }
  }
}
</script>

<style lang="scss" scoped>
.home-wrapper{
  width: 80%;
  display: flex;
  align-items: center;
  flex-direction: column;
  .home-top{
    width: 300px;
    height: 100px;
  }
  .bgColor1{
    background-color: red;
  }
  .bgColor2{
    background-color: orange;
  }
  .test{
    width: 300px;
    height: 200px;
  }
}

</style>

代码如上！