li由遍历得到，实现点击当前li更改背景色，其他的li样式不变

// 使用三目运算符 :class
<template>
	<div>
		<ul>
			<li v-for="item in info" :key="item.id" @click="change(item)" :class='item.id==selected?"selected":""'>{{item.name}}</li>
		</ul>
	</div>
</template>

export default {
  data() {
    return {
      info:[{
        id:1,
        name:'张三'
      },{
        id:2,
        name:'李四'
      },{
        id:3,
        name:'王五'
      },{
        id:4,
        name:'丁二'
      },{
        id:5,
        name:'魏潇'
      }],
      selected:-1
    }
  },
  methods: {
    change(item){
      console.log(item)
      this.selected=item.id;
    }
  }
}

.selected{
  color:red;
}