antd+vue表格固定列之后出现空白列，如下：

代码如下：

<a-col :md="24">
  <h4>表格固定列</h4>
  <a-table :columns="columns" :data-source="dataTable" :scroll="{ x: 900 }" bordered>
    <a slot="action" slot-scope="text, record" href="javascript:;" @click="handleOk(record.id)">action</a>
  </a-table>
</a-col>

export default { 
  data () { 
    return { 
      columns: [
        {  title: 'Column 1', dataIndex: 'address', key: '1' },
        {  title: 'Column 2', dataIndex: 'address', key: '2' },
        {  title: 'Column 3', dataIndex: 'address', key: '3' },
        {  title: 'Column 4', dataIndex: 'address', key: '4' },
        {  title: 'Column 5', dataIndex: 'address', key: '5' },
        {  title: 'Column 6', dataIndex: 'address', key: '6' },
        {  title: 'Column 7', dataIndex: 'address', key: '7' },
        {  title: 'Column 8', dataIndex: 'address', key: '8' },
        { 
          // width: 100,
          title: 'Action',
          key: 'operation',
          fixed: 'right',
          scopedSlots: {  customRender: 'action' }
        }
      ],
      dataTable: [
        { 
          address: 'London Park'
        }
      ]
    }
  }
}

改进方案：
给固定列添加宽度：

{ 
  width: 100,
  title: 'Action',
  key: 'operation',
  fixed: 'right',
  scopedSlots: {  customRender: 'action' }
}