el-table单选（简单应急版）

 <el-table-column v-if="!isMulti" width="40" class-name="column-radio">
      <template v-slot="{row,$index}">
          <el-radio v-model="radio" :label="$index"  @change="selection=[row]">
              <span></span>
          </el-radio>
     </template>
</el-table-column>

span 覆盖默认标签
@change直接替换已选项