<cn>
#### 基本用法
最简单的用法，展示可勾选，可选中，禁用，默认展开等功能。
</cn>

<us>
#### Basic
The most basic usage, tell you how to use checkable, selectable, disabled, defaultExpandKeys, and etc.
</us>

```html
<template>
  <a-tree
    checkable
    :treeNodes="treeData"
    :defaultExpandedKeys="['0-0-0', '0-0-1']"
    :defaultSelectedKeys="['0-0-0', '0-0-1']"
    :defaultCheckedKeys="['0-0-0', '0-0-1']"
    @select="this.onSelect"
    @check="this.onCheck"
  >
    <span slot="title0010" style="color: #1890ff">sss</span>
  </a-tree>
</template>
<script>
const treeData = [{
  title: 'parent 1',
  key: '0-0',
  children: [{
    title: 'parent 1-0',
    key: '0-0-0',
    disabled: true,
    children: [
      { title: 'leaf', key: '0-0-0-0', disableCheckbox: true },
      { title: 'leaf', key: '0-0-0-1' },
    ],
  }, {
    title: 'parent 1-1',
    key: '0-0-1',
    children: [
      { key: '0-0-1-0', slots: { title: 'title0010' }},
    ],
  }],
}]

export default {
  data () {
    return {
      treeData,
    }
  },
  methods: {
    onSelect (selectedKeys, info) {
      console.log('selected', selectedKeys, info)
    },
    onCheck (checkedKeys, info) {
      console.log('onCheck', checkedKeys, info)
    },
  },
}

</script>

```
