element-ui表格中复选框只能选中一个

代码：

<el-table
          ref="multipleTable"
          :data="updatetableData"
          style="width: 100%"
          @selection-change="updatehandleSelectionChange"
          @select="select"
          @select-all="selectAll"
        >
          <el-table-column type="selection"></el-table-column>
          <el-table-column prop="id" label="ID"></el-table-column>
          <el-table-column prop="name" label="精品名称"></el-table-column>
          <el-table-column prop="tag" label="排序">
            <template slot-scope="scope">
              <el-input v-model="scope.row.sort" />
            </template>
          </el-table-column>
        </el-table>

methods中：

select(selection, row) {
      if (selection.length > 1) {
        let del_row = selection.shift()
        this.$refs.multipleTable.toggleRowSelection(del_row, false)
      }
    },
selectAll(selection){
      if (selection.length > 1) {
        selection.length = 1
      }
    }