doc: add dropdownVisibleChange, close #5195
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				|  | @ -55,12 +55,13 @@ Tree selection control. | |||
| 
 | ||||
| ### Events | ||||
| 
 | ||||
| | Events Name | Description | Arguments | | ||||
| | --- | --- | --- | | ||||
| | change | A callback function, can be executed when selected treeNodes or input value change | function(value, label, extra) | | ||||
| | search | A callback function, can be executed when the search input changes. | function(value: string) | | ||||
| | select | A callback function, can be executed when you select a treeNode. | function(value, node, extra) | | ||||
| | treeExpand | A callback function, can be executed when treeNode expanded | function(expandedKeys) | | ||||
| | Events Name | Description | Arguments | Version | | ||||
| | --- | --- | --- | --- | | ||||
| | change | A callback function, can be executed when selected treeNodes or input value change | function(value, label, extra) |  | | ||||
| | search | A callback function, can be executed when the search input changes. | function(value: string) |  | | ||||
| | select | A callback function, can be executed when you select a treeNode. | function(value, node, extra) |  | | ||||
| | treeExpand | A callback function, can be executed when treeNode expanded | function(expandedKeys) |  | | ||||
| | dropdownVisibleChange | Called when dropdown open | function(open) | 3.0 | | ||||
| 
 | ||||
| ### Tree Methods | ||||
| 
 | ||||
|  |  | |||
|  | @ -56,12 +56,13 @@ cover: https://gw.alipayobjects.com/zos/alicdn/Ax4DA0njr/TreeSelect.svg | |||
| 
 | ||||
| ### 事件 | ||||
| 
 | ||||
| | 事件名称   | 说明                   | 回调参数                      | | ||||
| | ---------- | ---------------------- | ----------------------------- | | ||||
| | change     | 选中树节点时调用此函数 | function(value, label, extra) | | ||||
| | search     | 文本框值变化时回调     | function(value: string)       | | ||||
| | select     | 被选中时调用           | function(value, node, extra)  | | ||||
| | treeExpand | 展开节点时调用         | function(expandedKeys)        | | ||||
| | 事件名称              | 说明                   | 回调参数                      | 版本 | | ||||
| | --------------------- | ---------------------- | ----------------------------- | ---- | | ||||
| | change                | 选中树节点时调用此函数 | function(value, label, extra) |      | | ||||
| | search                | 文本框值变化时回调     | function(value: string)       |      | | ||||
| | select                | 被选中时调用           | function(value, node, extra)  |      | | ||||
| | treeExpand            | 展开节点时调用         | function(expandedKeys)        |      | | ||||
| | dropdownVisibleChange | 展开下拉菜单的回调     | function(open)                | 3.0  | | ||||
| 
 | ||||
| ### Tree 方法 | ||||
| 
 | ||||
|  |  | |||
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