Location
一个服务，应用可以用它来与浏览器的 URL 互动。
A service that applications can use to interact with a browser's URL.
class Location {
static normalizeQueryParams: (params: string) => string
static joinWithSlash: (start: string, end: string) => string
static stripTrailingSlash: (url: string) => string
path(includeHash: boolean = false): string
getState(): unknown
isCurrentPathEqualTo(path: string, query: string = ''): boolean
normalize(url: string): string
prepareExternalUrl(url: string): string
go(path: string, query: string = '', state: any = null): void
replaceState(path: string, query: string = '', state: any = null): void
forward(): void
back(): void
onUrlChange(fn: (url: string, state: unknown) => void)
subscribe(onNext: (value: PopStateEvent) => void, onThrow?: (exception: any) => void, onReturn?: () => void): SubscriptionLike
}
子类
说明
这取决于使用了哪个 LocationStrategy，Location 可能会使用 URL 的路径进行持久化，也可能使用 URL 的哈希片段（#）进行持久化。
Depending on the LocationStrategy used, Location persists to the URL's path or the URL's hash segment.
静态属性
| 属性 | 说明 |
|---|---|
static normalizeQueryParams: (params: string) => string | 给定 URL 参数字符串，如果需要则增加 '?' 前缀，否则原样返回。 Normalizes URL parameters by prepending with |
static joinWithSlash: (start: string, end: string) => string | 给定 url 的两个部分，把它们连接（join）在一起，如有必要则添加一个斜杠。 Joins two parts of a URL with a slash if needed. |
static stripTrailingSlash: (url: string) => string | 如果 url 具有结尾斜杠，则移除它，否则原样返回。 该方法会查找第一个 Removes a trailing slash from a URL string if needed. Looks for the first occurrence of either |
方法
返回标准化之后的 URL 路径 Normalizes the URL path for this location. |
Reports the current state of the location history. |
参数没有参数。 返回值
|
对指定的路径进行标准化，并和当前的标准化路径进行比较。 Normalizes the given path and compares to the current normalized path. |
给出一个字符串形式的 URL，返回一个去掉末尾斜杠之后的 URL 路径。 Normalizes a URL path by stripping any trailing slashes. |
Normalizes an external URL path. If the given URL doesn't begin with a leading slash ( |
把浏览器的 URL 修改为指定 URL 的标准化版本，并往所属平台（如浏览器）的历史堆栈中追加一个新条目。 Changes the browser's URL to a normalized version of a given URL, and pushes a new item onto the platform's history. |
把浏览器的 URL 修改为指定 URL 的标准化版本，并替换所属平台（如浏览器）的历史堆栈的顶部条目。 Changes the browser's URL to a normalized version of the given URL, and replaces the top item on the platform's history stack. |
在所属平台（如浏览器）的历史堆栈中前进一步。 Navigates forward in the platform's history. |
参数没有参数。 返回值
|
在所属平台（如浏览器）的历史堆栈中后退一步。 Navigates back in the platform's history. |
参数没有参数。 返回值
|
Registers a URL change listener. Use to catch updates performed by the Angular framework that are not detectible through "popstate" or "hashchange" events. |
订阅所属平台（如浏览器）的 Subscribes to the platform's | |||||||||
参数
返回值已订阅的事件。
|
使用说明
最好使用 Router服务来触发路由变更。只有当你要在路由体系之外创建规范化 URL 或与之交互时才会用到 Location。
It's better to use the Router#navigate service to trigger route changes. Use Location only if you need to interact with or create normalized URLs outside of routing.
Location 负责基于应用的基地址（base href）对 URL 进行标准化。 所谓标准化的 URL 就是一个从主机（host）开始算的绝对地址，包括应用的基地址，但不包括结尾的斜杠：
Location is responsible for normalizing the URL against the application's base href. A normalized URL is absolute from the URL host, includes the application's base href, and has no trailing slash:
/my/app/user/123是标准化的/my/app/user/123is normalizedmy/app/user/123不是标准化的my/app/user/123is not normalized/my/app/user/123/不是标准化的/my/app/user/123/is not normalized
Example
import {Location, LocationStrategy, PathLocationStrategy} from '@angular/common';
import {Component} from '@angular/core';
@Component({
selector: 'path-location',
providers: [Location, {provide: LocationStrategy, useClass: PathLocationStrategy}],
template: `
<h1>PathLocationStrategy</h1>
Current URL is: <code>{{location.path()}}</code><br>
Normalize: <code>/foo/bar/</code> is: <code>{{location.normalize('foo/bar')}}</code><br>
`
})
export class PathLocationComponent {
location: Location;
constructor(location: Location) {
this.location = location;
}
}
