描述：实现对一组数据进行全选，反选、多选操作

全选

handleCheckAllChange(val) {
  this.checkedCities = val ? cityOptions : [];
  this.isIndeterminate = false;
  this.checkInvert = false;
}

反选

handleInvertCheckChange(val) {
  let cities = this.cities;
  let checkedCities = this.checkedCities;
  if (checkedCities.length === 0) {
    checkedCities = val ? cities : [];
  } else if (checkedCities.length === cities.length) {
    this.checkedCities = [];
    this.checkAll = false;
  } else {
    let list = cities.concat(checkedCities).filter((v, i, array) => {
      return array.indexOf(v) === array.lastIndexOf(v);
    });
    this.checkedCities = list;
  }
}

多选

handleCheckedCitiesChange(value) {
  let checkedCount = value.length;
  this.checkAll = checkedCount === this.cities.length;
  this.isIndeterminate =
    checkedCount > 0 && checkedCount < this.cities.length;
  this.checkInvert = false;
}

完整代码

<template>
  <div>
    <el-checkbox
      v-model="checkAll"
      @change="handleCheckAllChange"
      :indeterminate="isIndeterminate"
      >全选</el-checkbox
    >
    <el-checkbox v-model="checkInvert" @change="handleInvertCheckChange"
      >反选</el-checkbox
    >
    <el-checkbox-group
      v-model="checkedCities"
      @change="handleCheckedCitiesChange"
    >
      <el-checkbox v-for="city in cities" :label="city" :key="city">{{
        city
      }}</el-checkbox>
    </el-checkbox-group>
  </div>
</template>

<script>
const cityOptions = ["上海", "北京", "广州", "深圳"];
export default {
  data() {
    return {
      checkAll: false,
      checkInvert: false,
      checkedCities: ["上海", "北京"],
      cities: cityOptions,
      isIndeterminate: true,
    };
  },
  methods: {
    // 全选
    handleCheckAllChange(val) {
      this.checkedCities = val ? cityOptions : [];
      this.isIndeterminate = false;
      this.checkInvert = false;
    },
    // 反选
    handleInvertCheckChange(val) {
      let cities = this.cities;
      let checkedCities = this.checkedCities;
      if (checkedCities.length === 0) {
        checkedCities = val ? cities : [];
      } else if (checkedCities.length === cities.length) {
        this.checkedCities = [];
        this.checkAll = false;
      } else {
        let list = cities.concat(checkedCities).filter((v, i, array) => {
          return array.indexOf(v) === array.lastIndexOf(v);
        });
        this.checkedCities = list;
      }
    },
    // 多选
    handleCheckedCitiesChange(value) {
      let checkedCount = value.length;
      this.checkAll = checkedCount === this.cities.length;
      this.isIndeterminate =
        checkedCount > 0 && checkedCount < this.cities.length;
      this.checkInvert = false;
    },
  },
};
</script>

<style>
</style>