ElementUI el-tree 获取节点点击选中状态与半选处理

          <el-tree
            :data="organizationData"
            :props="defaultProps"
            :check-strictly="isAssociate"
            node-key="organizationId"
            :expand-on-click-node="false"
            @check="getCurrentNode"
            ref="tree"
          >
          </el-tree>

    getCurrentNode(nodeObj, nodeState) {
      //判断当前状态是选中还是取消选中
      const isCheck = this.$refs.tree.getCheckedNodes().indexOf(nodeObj) > -1
      console.log(isCheck)
   }

    node-key：每个树节点用来作为唯一标识的属性，整棵树应该是唯一的。标识节点唯一的键值名称。
	default-checked-keys：对应el-tree多选树组件初始化时默认选中ID
	check-strictly：是否严格的遵循父子不互相关联的做法,默认为false
	check：当复选框被点击的时候触发的方法

methods：{
	<el-tree
        ref="tree"
        @check="check"           //选中或取消选中都会执行该方法
        :check-strictly="true"  //这里需要设置为true，不设置会回显未选中的节点
        :data="datalist"  //数据源  拿接口数据赋值就可
        show-checkbox
        node-key="id"
        :default-checked-keys="midPwList"   //这里需要后台返回id集合数组 ，给它赋值即可
        :props="{children: 'children',label: 'menuName',value:'id',disabled:disabledFn}">
        <template #default="{node,data}">
            <span class="custom-tree-node" >
            <span>{{ node.label }}</span>
            <span>
                <el-tag closable size="mini" v-for="(item,index) in data.btnBean" @close="cancel(item.id)"  :key="index">{{item.btnname}}</el-tag>
            </span>
            </span>
        </template>
      </el-tree>
      <el-button type="text" size="medium" @click="quanxian(scope.row)">权限</el-button>

//调用check事件/下面三个方法都调用就可以实现，点击勾选父节点会跟随选中子节点/取消勾选父节点会跟随全部取消选中
check(currentObj, treeStatus) {
      // 用于：父子节点严格互不关联时，父节点勾选变化时通知子节点同步变化，实现单向关联。
      let selected = treeStatus.checkedKeys.indexOf(currentObj.id)
      //不等于-1当前是选中状态
      if (selected !== -1) {
        this.selectedParent(currentObj)
        //统一处理子节点为相同的勾选状态
        this.uniteChildSame(currentObj, true)
      }else {
        //等于 -1 是取消选中状态
        this.uniteChildSame(currentObj, false) //
      }
    },
    uniteChildSame(treeList, isSelected) {
      console.log(isSelected);
      this.$refs.tree.setChecked(treeList.id, isSelected)
      if (treeList.children) {
        for (let i = 0; i < treeList.children.length; i++) {
          this.uniteChildSame(treeList.children[i], isSelected)
        }
      }
    },
    selectedParent(currentObj) {
      let currentNode = this.$refs.tree.getNode(currentObj)
      console.log(currentNode);
      if (currentNode.parent.key !== undefined) {
        this.$refs.tree.setChecked(currentNode.parent, true)
        this.selectedParent(currentNode.parent)
      }
    },
    //回显勾选保存的数据
    quanxian(row){
     	 this.$nextTick(()=>{
         this.midPwList = JSON.parse(JSON.stringify(row.listRole));
       })
     }
}