el-date-picker时间插件，根据月份显示当前月的第一

//默认根据月份显示当前月的第一天和最后一天
<el-date-picker
            v-model="geMonth"
            type="month"
            placeholder="请选择账期"
            format="yyyy-MM"
            value-format="yyyy-MM"
            @change="getMyDateTime()"
></el-date-picker>

getMyDateTime() {
      const now = new Date(this.geMonth);
      const nowMonth = now.getMonth();
      const nowYear = now.getFullYear();
      const monthStartDate = new Date(nowYear, nowMonth, 1);
      const monthEndDate = new Date(nowYear, nowMonth + 1, 0);
      this.startTime2 = monthStartDate.getFullYear() + '-' + (monthStartDate.getMonth() + 1) + '-' + monthStartDate.getDate()
      this.endTime2 = monthEndDate.getFullYear() + '-' + (monthEndDate.getMonth() + 1) + '-' + monthEndDate.getDate()
    }