### 基本用法

#### Tag 方式

``` html { width: 30% }
<u-tree-view value="1.2">
    <u-tree-view-node text="节点 1" value="1">
        <u-tree-view-node text="节点 1.1" value="1.1"></u-tree-view-node>
        <u-tree-view-node text="节点 1.2" value="1.2">
            <u-tree-view-node text="节点 1.2.1" value="1.2.1"></u-tree-view-node>
            <u-tree-view-node text="节点 1.2.2" value="1.2.2"></u-tree-view-node>
        </u-tree-view-node>
        <u-tree-view-node text="节点 1.3" value="1.3"></u-tree-view-node>
        <u-tree-view-node text="节点 1.4" value="1.4"></u-tree-view-node>
    </u-tree-view-node>
    <u-tree-view-node text="节点 2" value="2"></u-tree-view-node>
    <u-tree-view-node text="节点 3" value="3">
        <u-tree-view-node text="节点 3.1" value="3.1"></u-tree-view-node>
        <u-tree-view-node text="节点 3.2" value="3.2"></u-tree-view-node>
    </u-tree-view-node>
</u-tree-view>
```