vue element-ui el-table 展开行/多级 多选框

<template>
  <el-table
    ref="multipleTable"
    @select-all="selectAll"
    @select="selectTr"
    :data="tableData"
    style="width: 100%"
    row-key="id"
    border
    default-expand-all
    :tree-props="{ children: 'children', hasChildren: 'hasChildren' }"
  >
    <el-table-column type="selection" align="center" width="55">
    </el-table-column>
    <el-table-column prop="name" label="名称" align="center"> </el-table-column>
    <el-table-column prop="date" label="日期" align="center"> </el-table-column>
  </el-table>
</template>

<script>
export default {
  data() {
    return {
      tableData: [
        {
          id: 2,
          date: "2016-05-04",
          name: "1111111111",
          isChecked: false,
        },
        {
          id: 3,
          date: "2016-05-01",
          name: "22222222",
          isChecked: false,
          children: [
            {
              id: 5,
              date: "2016-05-01",
              name: "22221111",
              isChecked: false,
              children: [
                {
                  id: 6,
                  date: "2016-05-01",
                  name: "223344",
                  isChecked: false,
                },
                {
                  id: 7,
                  date: "2016-05-01",
                  name: "223344",
                  isChecked: false,
                },
              ],
            },
            {
              id: 4,
              date: "2016-05-01",
              name: "22224444",
              isChecked: false,
            },
          ],
        },
      ],
    };
  },
  methods: {
    selectAll() {
      this.isAllSelect = !this.isAllSelect;
      let data = this.tableData;
      this.toggleSelect(data, this.isAllSelect, "all");
    },
    //选择某行
    selectTr(selection, row) {
      this.$set(row, "isChecked", !row.isChecked);
      this.$nextTick(() => {
        this.isAllSelect = row.isChecked;
        this.toggleSelect(row, row.isChecked, "tr");
      });
    },
    //递归子级
    toggleSelect(data, flag, type) {
      if (type === "all") {
        if (data.length > 0) {
          data.forEach((item) => {
            this.toggleSelection(item, flag);
            if (item.children && item.children.length > 0) {
              this.toggleSelect(item.children, flag, type);
            }
          });
        }
      } else {
        if (data.children && data.children.length > 0) {
          data.children.forEach((item) => {
            item.isChecked = flag;
            this.$refs.multipleTable.toggleRowSelection(item, flag);
            this.toggleSelect(item, flag, type);
          });
        }
      }
    },
    //改变选中
    toggleSelection(row, flag) {
      this.$set(row, "isChecked", flag);
      this.$nextTick(() => {
        if (flag) {
          this.$refs.multipleTable.toggleRowSelection(row, flag);
        } else {
          this.$refs.multipleTable.clearSelection();
        }
      });
    },
  },
};
</script>

<style></style>

        

（XLSX）导出选中数据

1. el-table复制一份
2. 选中的数据赋值到新table
3. 导出新table
4. XLSX使用说明.