element表格状态转换

<el-table-column align="center" label="优先级" width="160">
              <template slot-scope="scope">
                <span v-if="scope.row.priority == 0">严重</span>
                <span v-if="scope.row.priority == 1">一般</span>
                <span v-if="scope.row.priority == 2">致命</span>
                <span v-if="scope.row.priority == 3">建议</span>
              </template>
            </el-table-column>