获取当前加载组件的路由信息可以使用ActivatedRoute。ActivatedRoute接口如下：
interface ActivatedRoute {
snapshot: ActivatedRouteSnapshot
url: Observable
params: Observable
queryParams: Observable
fragment: Observable
data: Observable
outlet: string
component: Type | string | null
get routeConfig: Route | null
get root: ActivatedRoute
get parent: ActivatedRoute | null
get firstChild: ActivatedRoute | null
get children: ActivatedRoute[]
get pathFromRoot: ActivatedRoute[]
get paramMap: Observable
get queryParamMap: Observable
toString(): string
}
可以看到ActivatedRoute提供了url，params，queryParams等。ActivatedRoute这几个属性返回的是Observable，它是可以用来监控url，参数的变化。
注入使用如下：
@Component({...})
class MyComponent {
constructor(private route: ActivatedRoute) {
const id: Observable = route.params.map(p => p.id); //获取参数
const url: Observable = route.url.map(segments => segments.join('')); //获取拼接的url
const user = route.data.map(d => d.user); //获取数据
}
}
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