<el-date-picker
      id='getweekDate'
      v-model="weekDate"
      type="week"
      format="yyyy 第 WW 周"
      placeholder="选择周">

data（）{
return {
weekData: null,
weekDataNow: null
}
}

watch: {
weekData() {
if( this.weekData !== null) {
this.$nextTick(()=>{
this.weekDataNow = document.querySelector('#getweekData').value
})
}
}
}