固定左边列

:fixed="list.length>0?true:false"

      <el-table-column label="用户认证信息" :fixed="list.length>0?true:false" width="430">
        <el-table-column prop="name" label="教师姓名" width="110"></el-table-column>
        <el-table-column prop="phone" label="手机号码" width="110"></el-table-column>
        <el-table-column prop="IDcard" label="身份证号码" width="210"></el-table-column>
      </el-table-column>