1.html代码

<el-date-picker
  class="pickerStyle"
  v-model="times"
  type="month"
  size="small"
  @change="changeMonth"
  placeholder="选择月">
</el-date-picker>

2.js代码

changeMonth(value){
  let date = new Date(value);
  let month = (date.getMonth() + 1).toString().padStart(2,'0');
  let year = date.getFullYear();
  let startTime = year + '' + month + '01';
  let day = new Date(year,month,0);
  let endTime = year + '' + month + '' + day.getDate();
  console.log(startTime,'startTime');
  console.log(endTime ,'endTime ');
}