html

<el-select v-model="mainbrand" filterable multiple @change="changeselect" clearable placeholder="請選擇">
      <el-option v-for="item in brandoption" :key="item.id" :label="item.name" :value="item.id"> </el-option>

</el-select>

js
回顯

var arr = []

                arr = res.data.brandCodes.split(';')

                arr = arr.map(Number)

                this.mainbrand = arr

                console.log(this.mainbrand)

同時得到id和name

changeselect(val) {

            console.log(val)

            let arr= []
 

            this.brandoption.forEach(item => {

                for (let i = 0; i < val.length; i++) {

                    if (item.id == val[i]) {

                        arr.push(item.name)

                    }

                }

            })

        },

//val  為id們    arr為name們

//this.brandoption  下拉框數(shù)據(jù)