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# 基本
- order: 3
点击菜单项后会触发事件,用户可以通过相应的菜单项 key 进行不同的操作。
---
````jsx
var Menu = antd.Menu;
var Dropdown = antd.Dropdown;
9 years ago
var onClick = function ({key}){
alert('选中了菜单' + key);
};
var menu = <Menu onClick={onClick}>
<Menu.Item key="1">第一个菜单项</Menu.Item>
<Menu.Item key="2">第二个菜单项</Menu.Item>
<Menu.Item key="3">第三个菜单项</Menu.Item>
</Menu>;
React.render(
<Dropdown overlay={menu}>
<button className="ant-btn ant-btn-menu">
鼠标移入,点击菜单 <i className="anticon anticon-down"></i>
</button>
</Dropdown>
, document.getElementById('components-dropdown-demo-event'));
````