elementUI tree常见问题解决办法

设置节点展开与选中：

let expandNode = this.$refs.treeLazy.getNode(data.data[0]);
expandNode.expand();
this.$refs.treeLazy.setCurrentNode(data.data[0]);

某个数据更新后要重新刷新树的数据：

if (this.$refs.treeLazy && this.$refs.treeLazy.root) {this.$refs.treeLazy.root.loaded = false;this.$refs.treeLazy.root.loadData();
}

单选树的节点，@check事件触发：

let nodeChecked = this.$refs.treeLazy.getNode(data).checked;
if (nodeChecked) {this.$refs.treeLazy.setCheckedNodes([data]);
} else {this.$refs.treeLazy.setCheckedNodes([]);
}

树节点按层数加载：

if (node.level === 0) {resolve(data)
}
if (node.level === 1) {resolve(data1);
}
if (node.level === 2) {resolve([])
}