把"scoped"删除，复制下面的代码

<style lang="less">
.el-table{
  overflow: auto;
}
.el-table .el-table__body-wrapper,
.el-table .el-table__header-wrapper,
.el-table .el-table__footer-wrapper{
  overflow: visible;
}
.el-table::after{
  position:relative !important;
}
</style>