vue 点击当前item项,实现单选或多选高亮业务

单选业务：

template

<template>
  <div class="a-page">
    <ui>
      <li
        v-for="(item, index) in obj"
        :key="index"
        :class="{ active: index == currentIndex }"
        @click="onClickLi(index)"
      >
        {
   
   { item.names }}
      </li>
    </ui>
  </div>
</template>

css

<style lang="scss" scoped>
.a-page {
  padding: 30px;
}
li {
  color: #333;
}
.active {
  color: red !important;
}
</style>

js

<script setup>
import {ref} from 'vue'
let obj = [
  { names: '唐僧', checked: false },
  { names: '孙悟空', checked: false },
  { names: '猪八戒', checked: false },
  { names: '悟静', checked: false },
  { names: '玫瑰', checked: false },
  { names: '向日葵', checked: false },
  { names: '百合', checked: false },
  { names: '海棠', checked: false }
]
const currentIndex = ref()
const onClickLi = (index) => {
  currentIndex.value = index
}
</script>

多选业务：

 template

  <div class="a-page">
    <ui>
      <li
        v-for="(item, index) in obj"
        :key="index"
        :class="{ active: item.checked }"
        @click="onClickLi(item, index)"
      >
        {
   
   { item.names }}
      </li>
    </ui>
  </div>

 js

<script setup>
import { ref } from 'vue'
let obj = ref([
  { names: '唐僧', checked: false, id: 1 },
  { names: '孙悟', checked: false, id: 2 },
  { names: '猪八', checked: false, id: 3 },
  { names: '悟静', checked: false, id: 4 },
  { names: '玫瑰', checked: false, id: 5 },
  { names: '向日', checked: false, id: 6 },
  { names: '百合', checked: false, id: 7 },
  { names: '海棠', checked: false, id: 8 }
])

const list = ref([]) //存储多选的数据
const onClickLi = (item, index) => {
  obj.value.forEach((item1) => {
    if (item.id == item1.id) {
      item1.checked = !item1.checked
      if(item1.checked){
        list.value.push(item1)
      }else{
        list.value.splice(list.value.indexOf(item1),1)
      }
    }
  })
  console.log(list.value);
}
</script>

 下面贴出来实验代码：

巧妙的利用数组的some和filter方法，进行数据的多选 / style控制 及 选择限制，项目中可以择优选择套用

<template>
  <div>
    <div v-for="tag in tags" :key="tag.id" :class="{ 'selected': isSelected(tag) }" @click="toggleTag(tag)">
      {
   
   { tag.name }}
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      tags: [
        { id: 1, name: '标签1' },
        { id: 2, name: '标签2' },
        { id: 3, name: '标签3' },
        { id: 4, name: '标签4' },
        { id: 5, name: '标签5' },
      ],
      selectedTags: [],
    };
  },
  computed: {
    selectedCount() {
      return this.selectedTags.length;
    },
  },
  methods: {
    toggleTag(tag) {
      if (this.selectedCount >= 3 && !this.isSelected(tag)) {
        return;
      }
      console.log(this.isSelected(tag));
      if (this.isSelected(tag)) {
        this.selectedTags = this.selectedTags.filter((t) => t.id !== tag.id);
      } else {
        this.selectedTags.push(tag);
      }
      console.log(this.selectedTags);
    },
    isSelected(tag) {
      return this.selectedTags.some((t) => t.id === tag.id);
    },
  },
};
</script>

<style>
.selected {
  background-color: #ccc;
}
</style>