UseSelect.vue

<template>
  <SelectAll :options="options" :propValue="propValue" : @select-hidden="getList"/>
</template>

<script lang="ts" setup>
import SelectAll from '../components/SelectAll.vue'
// 多选的值
let propValue= ref([] as String[])
// 获取子组件选的数据
const getList =(list:string[])=>{
  console.log(list);
  propValue.value = list;
};
// 传给SelectAll组件的数据列表
const options = [
  {
    value: 'Option1',
    label: 'Option1',
  },
  {
    value: 'Option2',
    label: 'Option2',
  },
  {
    value: 'Option3',
    label: 'Option3',
  },
  {
    value: 'Option4',
    label: 'Option4',
  },
  {
    value: 'Option5',
    label: 'Option5',
  },
]
</script>

SelectAll.vue

<template>
  <el-select v-model="selectValue" class="m-2" placeholder="Select" multiple collapse-tags collapse-tags-tooltip size="large"
    @change="select" @visible-change="selectHidden"
  >
    <el-checkbox v-model="checked1" label="全选" size="large" @change="checkAll" />
    <el-option
      v-for="item in options"
      :key="item.value"
      :label="item.label"
      :value="item.value"
    />
  </el-select>
</template>

<script lang="ts" setup>

import { ref  } from 'vue'
interface Props  {
  value:string,
  label:string
}
// 接受UseSelect的传参
const props = defineProps<{
  options: Array<Props>,
  propValue:[] as String[]
}>();
const options = props.options;
let selectValue=props.propValue;
// 注册子传父事件，将选择的多选数据传给UseSelect
const emit = defineEmits(['select-hidden'])
const selectHidden = (e:boolean) => {
  if(!e){
    emit('select-hidden', selectValue.value)
  }
}
// 全选checkbox开关
const checked1=ref(false);
// 全选、取消全选事件
const checkAll = ()=>{
  if(checked1.value){
    options.forEach(item=>{
      selectValue.value.push(item.value) 
    })
    
  }else{
    selectValue.value = []
  }
};
// select的change事件
const select=()=>{
  if(selectValue.value.length===options.length){
    checked1.value = true
  }else{
    checked1.value = false
  }
};
</script>

再加个vue2的SelectAll.vue组件

<template>
    <div>
        <el-select v-model="valueList" collapse-tags multiple placeholder="请选择" 
            @change="select" @visible-change="selectHidden" clearable size="small">
            <el-checkbox v-model="checked" label="全选" size="large" @change="checkAll" />
            <el-option 
                v-for="item in options" 
                :key="item.value" 
                :label="item.label"
                :value="item.value" 
                size="small">
            </el-option>
        </el-select>
    </div>
</template>
<script>
export default {
    name:'SelectAll',
    props:{
        // 传入的下拉项数据
        options:{
            default:[],
            type:Array
        },
        // 传入输入框绑定的字段
        value:{
            default:[],
            type:Array
        },
    },
    data(){
        return{
            checked:false,
            valueList:this.value
        }
    },
    methods:{
        // 子组件向父组件传选中的值
        selectHidden(e){
            if(!e){
                this.$emit("select-hidden",this.valueList)
            }
        },
        // 全选事件
        checkAll(){
            this.valueList = []
            if(this.checked){
                this.options.forEach(item=>{
                    this.valueList.push(item.value) 
                })
            }
        },
        // 多选change事件
        select(){
            if(this.valueList.length===this.options.length){
                this.checked = true
            }else{
                this.checked = false
            }
        },
    }
}
</script>
<style scoped>

</style>