实现效果

完整代码

<div class="box-pos">
      <el-table ref="table" 
           :header-cell-style="{ color: '#FFF', background: '#333' }"
           :cell-style="{ color: '#FFF', background: '#333' }" 
           :data="grListData" style="width: 100%"
           @selection-change="selectionChange">
          <template slot="empty">
             <span style="color: #969799">{{ $t("NeoLight.empty") }}</span>
          </template>
          <el-table-column type="selection" width="50" />
          <el-table-column prop="plantCode" label="厂区" />
          <el-table-column prop="grCode" label="单据号" />
          <el-table-column prop="grItem" label="单据行" />
          <el-table-column prop="grDate" label="单据日期" />
          <el-table-column prop="materialCode" label="料号" />
          //........
     </el-table>
</div>

js代码

  data() {
        return {
            multipleSelection: [],
        };
    },
  methods: {
        selectionChange(data) {
            this.multipleSelection = []
            if (data.length > 1) {
                this.$refs.table.clearSelection()
                this.$refs.table.toggleRowSelection(data[data.length - 1])
            }
            this.multipleSelection = data[data.length - 1] ? [data[data.length - 1]] : []
        },
 }

隐藏表头上的全选Checkbox

.box-pos {
    /**找到表头那一行，然后把里面的复选框隐藏掉**/
    ::v-deep .el-table__header-wrapper .el-checkbox {
        display: none !important;
    }

}

参考链接：https://blog.csdn.net/a772116804/article/details/131899825