<el-pagination 
@size-change="handleSizeChange" 
@current-change="handleCurrentChange" 
:current-page="currentPage4" 
:page-sizes="[100, 200, 300, 400]" 
:page-size="100" 
layout="total, sizes, prev, pager, next, jumper" 
:total="400"> 
</el-pagination>

https://element.eleme.cn/#/zh-CN/component/pagination#dai-you-bei-jing-se-de-fen-ye

handleSizeChange是函数 要自己写一个到

methods里面