<el-date-picker
                  v-model="queryParam.yuedTime"
                  type="month"
                  placeholder="选择月"
                  @change="handleMonthChange">
                </el-date-picker>

方式一：在前端处理   @change="handleMonthChange" ，增加此方法

handleMonthChange(value) {
         const selectedDate = new Date(value);
          const firstDayOfMonth = new Date(selectedDate.getFullYear(), selectedDate.getMonth(), 2);//多加2天时间
          
          // 将处理后的日期数据存入 queryParam.yuedTime
          this.queryParam.yuedTime = firstDayOfMonth.toISOString(); // 这里可以根据后端接口的需求格式化日期数据

         // alert(this.queryParam.yuedTime)
      },

方法二：在后端处理，对月份增加一，然后进行相应处理

SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
			String formattedDate = sdf.format(YuedTime);
			Date dt=sdf.parse(formattedDate);
			Calendar rightNow = Calendar.getInstance();
			rightNow.setTime(dt);
			rightNow.add(Calendar.MONTH,1);//日期加1个月
			Date dt1=rightNow.getTime();
			String reStr = sdf.format(dt1);
			String reStr2=reStr.substring(0,4)+'-'+reStr.substring(4,6);