给尾元素after添加事件

:deep(.el-table-v2__header-cell[border="true"]) {
  border-right: 1px solid rgb(216, 216, 216);
  pointer-events: none;
  &::after {
    width: 5px;
    left: 10px;
    height: 50px;
    content: "";
    cursor: col-resize;
    position: relative;
    pointer-events: auto;
  }
}

给父元素添加pointer-events: none;阻止事件，给尾元素pointer-events: auto;放开，再给父元素添加事件即可