完美解决element table 懒加载父子勾选问题

使用element table 时发现如果勾选有异步的话就无法勾选子集 然后测试就提了bug给我
我在网上找了很多资料 试了以后还是不完美 有小问题 我就自己研究了下 改进了下
网上找的有勾选父节点 点击展开以后子节点没有勾选的问题 等等 我这个就解决异步展开勾选的问题

html部分

<template>
  <div>
    <el-table :data="tableData" style="width: 100%" 
    row-key="id" 
    border 
    lazy 
    :load="load" 
    :tree-props="{ children: 'children', hasChildren: 'hasChildren' }" 
    @select-all="selectAll" 
    @selection-change="handleSelectionChange" 
    @select="selectRow" 
    ref="multipleTable">
      <el-table-column type="selection" width="55"> </el-table-column>
      <el-table-column prop="date" label="日期" width="180"> </el-table-column>
      <el-table-column prop="name" label="姓名" width="180"> </el-table-column>
      <el-table-column prop="address" label="地址"> </el-table-column>
    </el-table>
  </div>
</template>

<script>
export default {
  name: "",
  data() {
    return {
      tableData: [
        {
          id: 1,
          date: "2016-05-02",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1518 弄",
        },
        {
          id: 2,
          date: "2016-05-04",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1517 弄",
        },
        {
          id: 3,
          date: "2016-05-01",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1519 弄",
          hasChildren: true,
        },
        {
          id: 4,
          date: "2016-05-03",
          name: "王小虎",
          address: "上海市普陀区金沙江路 1516 弄",
        },
      ],
      multipleSelection: [],
    };
  },
  mounted() {},
  created() {},
  methods: {
    load(tree, treeNode, resolve) {
      const table = this.$refs["multipleTable"];
      setTimeout(() => {
        const data = [
          {
            id: 31,
            date: "2016-05-01",
            name: "王小虎",
            address: "上海市普陀区金沙江路 1519 弄",
          },
          {
            id: 32,
            date: "2016-05-01",
            name: "王小虎",
            address: "上海市普陀区金沙江路 1519 弄",
          },
        ];
        tree.children = data;//获取数据后自己往父节点加数据
        resolve(data);//虽然下面一步会把数据加进去但是会在一直在加载中 所以就重复加载数据了
        this.$set(//更新table内部的数据  不这样的话勾选父节点以后子节点还是不能勾选 就很奇怪
          table.store.states.lazyTreeNodeMap,
          tree.supplierID, //父节点id
          tree.children //新数组
        );
        // 这里判断当前父节点是否有被勾选
        let dt = this.multipleSelection.find((m) => {
          return m.id == tree.id;
        });
        this.setChildren(tree.children, dt ? true : false);
      }, 1000);
    },
    setChildren(children, type) {
      // 编辑多个子层级
      children.map((j) => {
        this.toggleSelection(j, type);
        if (j.children) {
          this.setChildren(j.children, type);
        }
      });
    },
    // 选中父节点时，子节点一起选中取消
    async selectRow(selection, row) {
      const hasSelect = selection.some((el) => {
        return row.id === el.id;
      });
      if (hasSelect) {
        if (row.children) {
          // 解决子组件没有被勾选到
          this.setChildren(row.children, true);
        }
      } else {
        if (row.children) {
          this.setChildren(row.children, false);
        }
      }
    },
    // 选择全部
    selectAll(selection) {
      // tabledata第一层只要有在selection里面就是全选
      const isSelect = selection.some((el) => {
        const tableDataIds = this.tableData.map((j) => j.id);
        return tableDataIds.includes(el.id);
      });
      // tableDate第一层只要有不在selection里面就是全不选
      const isCancel = !this.tableData.every((el) => {
        const selectIds = selection.map((j) => j.id);
        return selectIds.includes(el.id);
      });
      if (isSelect) {
        selection.map((el) => {
          if (el.children) {
            // 解决子组件没有被勾选到
            this.setChildren(el.children, true);
          }
        });
      }
      if (isCancel) {
        this.tableData.map((el) => {
          if (el.children) {
            // 解决子组件没有被勾选到
            this.setChildren(el.children, false);
          }
        });
      }
    },
    toggleSelection(row, select) {
      if (row) {
        this.$nextTick(() => {
          this.$refs.multipleTable.toggleRowSelection(row, select);
        });
      }
    },
    handleSelectionChange(selection) {
      this.multipleSelection = selection;
    },
  },
};
</script>

到这里就结束啦 有问题可以提出来