【VUE】v-for循环出来的li元素，操作其中一个的样式

data设置数据

export default {
  name: 'HelloWorld',
  data () {
    return {
      msg: 'Welcome to Your Vue.js App',
      arr: [
        {msg: '666', index: '1'},
        {msg: '777', index: '2'},
        {msg: '888', index: '1'},
        {msg: '999', index: '2'}
      ]
    }
  }
}

标签遍历并判断class类

<template>
  <div class="hello">
    <h1>{{ msg }}</h1>
    <h2>Essential Links</h2>
    <ul>
      <li v-for="(item, index) in arr" :key="index" :class="item.index === '1'?'hello2':''">
        {{item.msg}}
      </li>
    </ul>
  </div>
</template>

定义css

.hello2{
  color: red
}

完整代码

<template>
  <div class="hello">
    <h1>{{ msg }}</h1>
    <h2>Essential Links</h2>
    <ul>
      <li v-for="(item, index) in arr" :key="index" :class="item.index === '1'?'hello2':''">
        {{item.msg}}
      </li>
    </ul>
  </div>
</template>

<script>
export default {
  name: 'HelloWorld',
  data () {
    return {
      msg: 'Welcome to Your Vue.js App',
      arr: [
        {msg: '666', index: '1'},
        {msg: '777', index: '2'},
        {msg: '888', index: '1'},
        {msg: '999', index: '2'}
      ]
    }
  }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
.hello2{
  color: red
}
h1, h2 {
  font-weight: normal;
}
ul {
  list-style-type: none;
  padding: 0;
}
li {
  display: inline-block;
  margin: 0 10px;
}
a {
  color: #42b983;
}
</style>