elementUI el-table的scope.row怎么理解

Question

<el-table :key='tableKey' :data="list" v-loading.body="listLoading" border fit highlight-current-row style="width: 100%">

  <el-table-column align="center" label="序号" width="65">

    <template scope="scope">

      <span>{{scope.row.id}}</span>

    </template>

  </el-table-column>

这个写法怎么的scope.row是什么写法呢