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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。
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---
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````jsx
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var Menu = antd.Menu;
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var Dropdown = antd.Dropdown;
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var Button = antd.Button;
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var Icon = antd.Icon;
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var onSelect = function ({key}){
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alert('选中了菜单' + key);
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};
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var menu = <Menu onSelect={onSelect}>
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<Menu.Item key="1">第一个菜单项</Menu.Item>
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<Menu.Item key="2">第二个菜单项</Menu.Item>
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<Menu.Item key="3">第三个菜单项</Menu.Item>
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</Menu>;
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React.render(
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<Dropdown overlay={menu}>
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<Button>
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鼠标移入，点击菜单 <Icon type="down" />
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</Button>
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</Dropdown>
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, document.getElementById('components-dropdown-demo-event'));
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````
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