# 基本

- order: 0

最简单的用法。

---

````jsx
import { TreeSelect } from 'antd';
const TreeNode = TreeSelect.TreeNode;

const Demo = React.createClass({
  getInitialState() {
    return {
      value: 'leaf1',
    };
  },
  onChange(value) {
    this.setState({ value });
  },
  render() {
    return (
      <TreeSelect style={{ width: 360 }} showSearch
        value={this.state.value} optionLabelProp="title"
        dropdownMenuStyle={{ maxHeight: 400, overflow: 'auto' }}
        treeDefaultExpandAll
        onChange={this.onChange}>
        <TreeNode value="parent 1" title="parent 1" key="0-1">
          <TreeNode value="parent 1-0" title="parent 1-0" key="0-1-1">
            <TreeNode value="leaf1" title="my leaf" key="random" />
            <TreeNode value="leaf2" title="your leaf" key="random1" />
          </TreeNode>
          <TreeNode value="parent 1-1" title="parent 1-1" key="random2">
            <TreeNode value="sss" title="sss" key="random3" />
          </TreeNode>
        </TreeNode>
      </TreeSelect>
    );
  },
});

ReactDOM.render(
  <Demo />
, mountNode);
````