vue实现页面之间的el-select同步数据选项

demo案例：

父组件的el-select发生改变，子组件的el-select也可以发生改变

子组件的el-select发生改变，父组件的el-select也可以发生改变

核心就是给el-select组件的v-modle值互传

Index父组件页面

<template lang="">
  <div>
    我是Index页面
    <el-form ref="form" :model="form" label-width="200px" >
      <el-form-item label="活动名称" class="my-form">
        <el-input v-model="form.name" style="width: 80%;" placeholder="请输入内容" :rows="100"></el-input>
      </el-form-item>
      <el-form-item label="活动区域">
        <el-select v-model="form.region" multiple placeholder="请选择活动区域" style="width: 80%;">
          <el-option v-for="item in devTypes" :label="item.name" :value="item.id" :key="item.id"></el-option>
        </el-select>
      </el-form-item>
      <el-form-item label="活动时间">
        <el-col :span="11">
          <el-date-picker type="date" placeholder="选择日期" v-model="form.date1" style="width: 80%;"></el-date-picker>
        </el-col>
        <el-col class="line" :span="2">-</el-col>
        <el-col :span="11">
          <el-time-picker placeholder="选择时间" v-model="form.date2" style="width: 80%;"></el-time-picker>
          <el-time-picker ></el-time-picker>
          <infection></infection>
        </el-col>
      </el-form-item>
      <el-form-item label="即时配送">
        <el-switch v-model="form.delivery"></el-switch>
      </el-form-item>
      <el-form-item label="活动性质">
        <el-checkbox-group v-model="form.type">
          <el-checkbox label="美食/餐厅线上活动" name="type"></el-checkbox>
          <el-checkbox label="地推活动" name="type"></el-checkbox>
          <el-checkbox label="线下主题活动" name="type"></el-checkbox>
          <el-checkbox label="单纯品牌曝光" name="type"></el-checkbox>
        </el-checkbox-group>
      </el-form-item>
      <el-form-item label="特殊资源">
        <el-radio-group v-model="form.resource">
          <el-radio label="线上品牌商赞助"></el-radio>
          <el-radio label="线下场地免费"></el-radio>
        </el-radio-group>
      </el-form-item>
      <el-form-item label="活动形式">
        <el-input type="textarea" v-model="form.desc" style="width: 80%;"></el-input>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" @click="onSubmit">立即创建</el-button>
        <el-button>取消</el-button>
      </el-form-item>

    </el-form>
 <Elselect :zhi="form.region" @zichuan="zichuan"/> 
  </div>
</template>
<script>
  import Elselect  from './Elselect .vue'
export default {
  name:'I-ndex',
  components:{
    Elselect 
  },
  data(){
    return{
      beneficial,
      
      devTypes:[
        {id:'1',name:'小李',age:'10'},
        {id:'2',name:'小李1',age:'11'},
        {id:'3',name:'小李3',age:'12'},
        {id:'4',name:'小李4',age:'12'},
      ],
      form: {
          name: '',
          region: '',
          date1: '',
          date2: '',
          delivery: false,
          type: [],
          resource: '',
          desc: '',
        },
        dialogVisible: true
    }
  },
  created(){
    let arr = [1,2,undefined,undefined,null,null,NaN,NaN,{},{},0,0] 
  },
  methods: {
    onSubmit(){
      console.log(this.form,'form')
    },
    zichuan(e){
      this.form.region = e
      console.log(e,'子给父传过来的')
    }




}
}
</script>
<style lang="scss" scoped>
/*  
 /deep/ .el-form-item__label{
    font-size: 40px;
  } */
  ::v-deep .el-form-item__label{
    font-size: 40px;
  } 
  .my-form  ::v-deep .el-form-item__label{
    font-size: 20px;
  }
  ::v-deep .el-input__inner::placeholder{
    /* color:aqua; */
    font-size: 20px;
  }
  /* ::v-deep .el-input__inner{
    min-height:80px;
    font-size: 30px;
  } */
  ::v-deep .el-textarea__inner{
    font-size: 30px;
  }
</style>

Elselect子页面

<template lang="">
  <div>
    我是Elselect页面
    <el-form ref="form" :model="form" label-width="200px" >
      <el-form-item label="活动区域1">
        <el-select v-model="z" multiple placeholder="请选择活动区域" style="width: 80%;" @change="zihcuanfu">
          <el-option v-for="item in devTypes" :label="item.name" :value="item.id" :key="item.id"></el-option>
        </el-select>
      </el-form-item>
      
        <el-button type="primary" @click="onSubmit">立即创建</el-button>
        <el-button>取消</el-button>
    </el-form>
  </div>
</template>
<script>
export default {
  name:'El-select',
  props:{
    zhi:Object
  },
  watch:{
zhi:{
  handler(val,old){
    console.log(val)
    this.z = val
  },
  deep:true,
  immediate:true
}
  },
  data(){
    return{
      z:'',
      devTypes:[
        {id:'1',name:'小李',age:'10'},
        {id:'2',name:'小李1',age:'11'},
        {id:'3',name:'小李3',age:'12'},
        {id:'4',name:'小李4',age:'12'},
      ],
      form: {
          name: '',
          region: '',
          date1: '',
          date2: '',
          delivery: false,
          type: [],
          resource: '',
          desc: '',
        },
    }
  },
  created(){
    let arr = [1,2,undefined,undefined,null,null,NaN,NaN,{},{},0,0] 
  },
  methods: {
    onSubmit(){
      console.log(this.form,'form')
    },
//change事件
    zihcuanfu(e){
      console.log(e,'e')
      this.$emit('zichuan',this.z)
    },




}
}
</script>