elementui设置el-table-column宽度百分比

1.el-table-column不设置width与minwidth,每一列自适应，宽度一致

2.el-table-column设置width=30%，无效。

　　el-table 组件会被 vue 解析成 html， width 设置百分比的值直接被解析去掉百分号变成 px 了

3.el-table-column设置min-width="30"或者30%，每一列都设置min-width才能实现每一列的百分比配置

<el-table
      :data="tableList"
      v-loading="loading"
      :header-cell-style="{background:'#eef1f6',color:'#606266'}"
      highlight-current-row
    >
      <el-table-column label="序号" type="index" min-width="5%" align="center"></el-table-column>
      <el-table-column prop="xxxx" label="xxxx" align="left" min-width="25%"></el-table-column>
      <el-table-column prop="xxxx" label="xxxx" align="center" :formatter="formatTd" min-width="12%"></el-table-column>
      <el-table-column prop="xxxx" label="xxxx" align="center" :formatter="formatTd" min-width="20%"></el-table-column>
      <el-table-column label="xxxx" align="center" :formatter="formatTd" min-width="12%">
        <template slot-scope="scope">
          <el-link
            type="primary"
            v-if="scope.row.xxxx"
            @click="xxxx(scope.row)"
          >{{scope.row.xxxx}}</el-link>
          <span v-else>--</span>
        </template>
      </el-table-column>
      <el-table-column prop="xxxx" label="xxxx" align="center" :formatter="formatTd" min-width="12%"></el-table-column>
      <el-table-column prop="xxxx" label="xxxx" align="center" :formatter="formatTd" min-width="12%"></el-table-column>
      <!-- 表格数据为空 -->
      <div slot="empty" v-show="isShow">
        <emptyTable emptyText="暂无相关数据"></emptyTable>
      </div>
    </el-table>