ant-design/components/dropdown/demo/event.md

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# 触发事件
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- order: 3
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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
import { Menu, Dropdown, Button, Icon } from 'antd';
const onSelect = function ({key}){
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alert('选中了菜单' + key);
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};
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const menu = <Menu onSelect={onSelect}>
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<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>;
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ReactDOM.render(
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<Dropdown overlay={menu}>
<Button>
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鼠标移入,点击菜单 <Icon type="down" />
</Button>
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</Dropdown>
, document.getElementById('components-dropdown-demo-event'));
````