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---
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category: Components
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subtitle: 面包屑
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type: 导航
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title: Breadcrumb
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cover: https://gw.alipayobjects.com/zos/alicdn/9Ltop8JwH/Breadcrumb.svg
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---
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显示当前页面在系统层级结构中的位置，并能向上返回。
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## 何时使用
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- 当系统拥有超过两级以上的层级结构时；
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- 当需要告知用户『你在哪里』时；
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- 当需要向上导航的功能时。
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## API
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### Breadcrumb
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| 参数 | 说明 | 类型 | 默认值 | 版本 |
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| --- | --- | --- | --- | --- |
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| itemRender | 自定义链接函数，和 react-router 配置使用 | (route, params, routes, paths) => ReactNode | - | |
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| params | 路由的参数 | object | - | |
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| routes | router 的路由栈信息 | [routes\[\]](#routes) | - | |
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| separator | 分隔符自定义 | string \| ReactNode | `/` | |
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### Breadcrumb.Item
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| 参数 | 说明 | 类型 | 默认值 | 版本 |
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| --- | --- | --- | --- | --- |
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| dropdownProps | 弹出下拉菜单的自定义配置 | [Dropdown](/components/dropdown) | - | |
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| href | 链接的目的地 | string | - | |
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| overlay | 下拉菜单的内容 | [Menu](/components/menu) \| () => Menu | - | |
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| onClick | 单击事件 | (e:MouseEvent) => void | - | |
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### Breadcrumb.Separator
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| 参数 | 说明 | 类型 | 默认值 | 版本 |
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| -------- | -------------- | ------------------- | ------ | ---- |
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| children | 要显示的分隔符 | string \| ReactNode | `/` | |
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> 注意：在使用 `Breadcrumb.Separator` 时，其父组件的分隔符必须设置为 `separator=""`，否则会出现父组件默认的分隔符。
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### routes
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```ts
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interface Route {
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path: string;
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breadcrumbName: string;
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children: Array<{
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path: string;
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breadcrumbName: string;
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}>;
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}
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```
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### 和 browserHistory 配合
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和 react-router 一起使用时，默认生成的 url 路径是带有 `#` 的，如果和 browserHistory 一起使用的话，你可以使用 `itemRender` 属性定义面包屑链接。
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```jsx
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import { Link } from 'react-router';
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const routes = [
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{
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path: 'index',
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breadcrumbName: 'home',
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},
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{
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path: 'first',
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breadcrumbName: 'first',
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children: [
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{
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path: '/general',
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breadcrumbName: 'General',
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},
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{
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path: '/layout',
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breadcrumbName: 'Layout',
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},
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{
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path: '/navigation',
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breadcrumbName: 'Navigation',
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},
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],
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},
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{
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path: 'second',
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breadcrumbName: 'second',
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},
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];
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function itemRender(route, params, routes, paths) {
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const last = routes.indexOf(route) === routes.length - 1;
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return last ? (
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<span>{route.breadcrumbName}</span>
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) : (
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<Link to={paths.join('/')}>{route.breadcrumbName}</Link>
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);
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}
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return <Breadcrumb itemRender={itemRender} routes={routes} />;
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```
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