Error：Invalid prop: custom validator check failed for prop "pagerCount".

• Element 分页使用 pager-count 报错

错误原因：pager-count只要5~21之间的奇数

 <el-pagination
  small
  layout="total, prev, pager, next"
  :pager-count="6"
  :page-size="pageData.pageSize"
  :total="pageData.total"
  :current-page="pageData.pageNo"
  @current-change="changePage"
>
</el-pagination>