3.绑定属性、绑定html、绑定class、绑定style

<template>
  <div id="app">
    
    <!-- 绑定属性 -->
    <br>
    <div v-bind:title='title'>鼠标悬浮出现</div>
    <br>
    <img :src="url" alt="仙女">
    

  </div>
</template>

<script>
export default {
  name: 'app',
  data () {
    return {
      title:'鼠标悬浮出现',
      url:'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1569319252742&di=0eaf19ed1e01d10d7f612da9434599a6&imgtype=0&src=http%3A%2F%2Fimg3.duitang.com%2Fuploads%2Fitem%2F201603%2F28%2F20160328121906_ErzAB.thumb.700_0.jpeg'
    }
  }
}
</script>

<style>

</style>

<template>
  <div id="app">
    
    <!-- html绑定 -->
    <div v-html="h"></div>

  </div>
</template>

<script>
export default {
  name: 'app',
  data () {
    return {
      h:'<h2>二级标题</h>'
    }
  }
}
</script>

<style>

</style>

<template>
  <div id="app">
    
    <!-- 绑定class -->
    <div :class="{'red':flag,'blue':!flag}">绑定class</div>
    <div :class="{'red':!flag,'blue':flag}">绑定class</div>

    <ul>
      <li v-for="(item,index) in list" :key=index :class="{'red':index==1,'blue':index==2}">{{item}}</li>
    </ul>

  </div>
</template>

<script>
export default {
  name: 'app',
  data () {
    return {
      flag:true,
      list:['第一行','第二行','第三行']
    }
  }
}
</script>

<style>

.red{color: red}
.blue{color:blue}

</style>

<template>
  <div id="app">
    <!-- 绑定style  -->
    <div class="box" :style="{width:boxWidth+'px'}">这是一个div</div>

  </div>
</template>
<script>
export default {
  name: 'app',
  data () {
    return {
      boxWidth:300
    }
  }
}
</script>
<style>
.box{
  height: 100px;
  width: 100px;
  background-color: aquamarine;
}
</style>