element el-tree树状数据

1.树状数据点击加载

 <el-tree class="filter-tree"  :props="defaultProps" :filter-node-method="filterNode"
            ref="tree" :load="loadNode" lazy @node-click="handleNodeClick">
          </el-tree>

 export default {
    data() {
      return {
	       defaultProps: {
	          children: '接收key(ID或)',
	          label: 'label'
	        }
        }
    }
methods：{
 loadNode(node, resolve) {
        setTimeout(() => {
            if (node.level == 0) {
              findRegionOrgByPermission().then(response => {
                const cities = response.data.map((value, i) => ({
                  value: value.regionId,
                  isSubordinateUnits: value.isSubordinateUnits,
                  label: value.name,
                  leaf: node.level >= 2
                }));
                resolve(cities);
              });
            }
            if (node.level == 1) {
              let data = {
                regionId: node.data.value,
                isSubordinateUnits: node.data.isSubordinateUnits
              }
              findRegionOrgByPermission(data).then(response => {
                const areas = response.data.map((value, i) => ({
                  value: value.regionId,
                  isSubordinateUnits: value.isSubordinateUnits,
                  label: value.name,
                  leaf: node.level >= 2
                }));
                resolve(areas);
              });
            } else if (node.level == 2) {
              let data = {
                regionId: node.data.value,
                isSubordinateUnits: node.data.isSubordinateUnits
              }
              findRegionOrgByPermission(data).then(response => {
                const areas = response.data.map((value, i) => ({
                  value: value.regionId,
                  isSubordinateUnits: value.isSubordinateUnits,
                  label: value.name,
                  leaf: node.level >= 2
                }));
                resolve(areas);

              });
            }
          },
          500);
      },
}

2.拖拽问题（节点内的拖拽）

<template>
  <div>
    <el-tree :data="data" node-key="id" default-expand-all @node-drag-start="handleDragStart"
      @node-drag-enter="handleDragEnter" @node-drag-leave="handleDragLeave" @node-drag-over="handleDragOver"
      @node-drag-end="handleDragEnd" @node-drop="handleDrop" draggable :allow-drop="allowDrop" :allow-drag="allowDrag">
    </el-tree>
  </div>
</template>
<script>
  export default {
    data() {
      return {
        data: [{
          id: 1,
          label: '一级 1',
          children: [{
            id: 4,
            label: '二级 1-1',
            children: [{
              id: 9,
              label: '三级 1-1-1'
            }, {
              id: 10,
              label: '三级 1-1-2'
            }]
          }]
        }, {
          id: 2,
          label: '一级 2',
          children: [{
            id: 5,
            label: '二级 2-1'
          }, {
            id: 6,
            label: '二级 2-2'
          }]
        }, {
          id: 3,
          label: '一级 3',
          children: [{
            id: 7,
            label: '二级 3-1'
          }, {
            id: 8,
            label: '二级 3-2',
            children: [{
              id: 11,
              label: '三级 3-2-1'
            }, {
              id: 12,
              label: '三级 3-2-2'
            }, {
              id: 13,
              label: '三级 3-2-3'
            }]
          }]
        }],
        defaultProps: {
          children: 'children',
          label: 'label'
        }
      };
    },
    methods: {
      handleDragStart(node, ev) {
        console.log('drag start', node);
      },
      handleDragEnter(draggingNode, dropNode, ev) {
        console.log('tree drag enter: ', dropNode.label);
      },
      handleDragLeave(draggingNode, dropNode, ev) {
        console.log('tree drag leave: ', dropNode.label);
      },
      handleDragOver(draggingNode, dropNode, ev) {
        console.log('tree drag over: ', dropNode.label);
      },
      handleDragEnd(draggingNode, dropNode, dropType, ev) {
        console.log('tree drag end: ', dropNode && dropNode.label, dropType);
      },
      //此时可以使用真实接口
      handleDrop(draggingNode, dropNode, dropType, ev) {
        console.log('tree drop: ', dropNode.label, dropType);
      },
      //拖拽时判定目标节点能否被放置
      allowDrop(draggingNode, dropNode, type) {
        console.log("起点", draggingNode)
        console.log("起点--id", draggingNode.id)
        console.log("起点--label", draggingNode.label)
        console.log("起点--父id", draggingNode.parent.id)
        console.log("终点", dropNode)
        console.log("终点--id", dropNode.id)
        console.log("终点---label", dropNode.label)
        console.log("终点--父id", dropNode.parent.id)
        console.log("3333", type)
        //层级判断
        if (draggingNode.level === dropNode.level) {
             //父级统一性判断
          if (draggingNode.parent.id === dropNode.parent.id) {
            return type !== 'inner'
          }
        } else {
          return false;
        }
      },
      //判断节点能否被拖拽
      allowDrag(draggingNode) {
        return true
      }
    }
  };

</script>