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1. Front-end:

 <el-form-item label="到访日期" prop="visitTime">
        <el-date-picker
          v-model="queryParams.visitTime"
          value-format="YYYY-MM-DD"
          type="daterange"
          start-placeholder="开始日期"
          end-placeholder="结束日期"
          class="!w-240px"
        />
      </el-form-item>
/** 查询列表 */
const getList = async () => {
  loading.value = true
  try {
    const data = await VisitManageApi.getVisitManagePage(queryParams)
    list.value = data.list
    total.value = data.total
  } finally {
    loading.value = false
  }
}
const queryParams = reactive({
  pageNo: 1,
  pageSize: 10,
  visitTime: [],
 
})

//API接口
+++++++++++++++++++++++++++++++++++++++++++++
export const VisitManageApi = {
  // 查询到访管理分页
  getVisitManagePage: async (params: any) => {
    console.log(params)
    return await request.get({ url: `/sale/visit-manage/page`, params })
  },
}

Second back end

//定义为数组，接收
Schema(description = "到访日期")
    @DateTimeFormat(pattern = "yyyy-MM-dd")
    private LocalDate[] visitTime;

  
//mybatisplus的lambdaquerywrapper查询
default PageResult<VisitManageDO> selectPage(VisitManagePageReqVO reqVO) {
        return selectPage(reqVO, new LambdaQueryWrapperX<VisitManageDO>()
  
                .betweenIfPresent(VisitManageDO::getVisitTime,reqVO.getVisitTime())
                .orderByDesc(VisitManageDO::getId));
    }

//实体类
@TableName("sale_visit_manage")
@KeySequence("sale_visit_manage_seq") // 用于 Oracle、PostgreSQL、Kingbase、DB2、H2 数据库的主键自增。如果是 MySQL 等数据库，可不写。
@Data
@EqualsAndHashCode(callSuper = true)
@ToString(callSuper = true)
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class VisitManageDO extends BaseDO {
 
    /**
     * 主键id
     */
    @TableId
    private Long id;
    /**
     * 学员姓名
     */
    private String studentName;
    /**
     * 手机号
     */
    private String studentPhone;
 
    /**
     * 接待人员
     */
    private String receptionPerson;
    /**
     * 学员来源
     *
     *
     */
    private String studentSource;
    /**
     * 意向级别
     *
     *
     */
    private String intentionLevel;
    /**
     * 当前年级
     *
     *
     */
    private String studentGrade;
    /**
     * 就读学校
     *
     *
     */
    private String studentSchool;
    /**
     * 是否试听
     */
    private String listenStatus;
    /**
     * 是否签约
     */
    private String signUpStatus;
    /**
     * 到访开始日期
     */
    private LocalDate visitTimeBegin;
    /**
     * 到访日期
     */
    private LocalDate visitTime;
    /**
     * 到访结束日期
     */
    private LocalDate visitTimeEnd;
    /**
     * 备注
     */
    private String remark;
 
}