RouterLinklink

说明link

考虑下列路由配置： [{ path: 'user/:name', component: UserCmp }]. 如果要链接到这个 user/:name 路由，你可以使用 RouterLink 指令。

Consider the following route configuration: [{ path: 'user/:name', component: UserCmp }]. When linking to this user/:name route, you use the RouterLink directive.

如果该链接是静态的，你可以使用下列指令： <a routerLink="/user/bob">链接到 user 组件</a>

If the link is static, you can use the directive as follows: <a routerLink="/user/bob">link to user component</a>

如果你要用动态值来生成该链接，你可以传入一组路径片段，每个片段后面都可以跟一些参数。

If you use dynamic values to generate the link, you can pass an array of path segments, followed by the params for each segment.

比如 ['/team', teamId, 'user', userName, {details: true}] 表示我们要生成一个到 /team/11/user/bob;details=true 的链接。

For instance ['/team', teamId, 'user', userName, {details: true}] means that we want to generate a link to /team/11/user/bob;details=true.

多个静态片段可以合并为一个（比如 ['/team/11/user', userName, {details: true}]）。

Multiple static segments can be merged into one (e.g., ['/team/11/user', userName, {details: true}]).

第一个参数名可以使用 /、./ 或 ../ 前缀：

The first segment name can be prepended with /, ./, or ../:

• 如果第一个片段用 / 开头，则路由器会从应用的根路由开始查找。

  If the first segment begins with /, the router will look up the route from the root of the app.

• 如果第一个片段用 ./ 开头或者没有用斜杠开头，路由器就会从当前激活路由开始查找。

  If the first segment begins with ./, or doesn't begin with a slash, the router will instead look in the children of the current activated route.

• 如果第一个片段以 ../ 开头，则路由器将会向上找一级。

  And if the first segment begins with ../, the router will go up one level.

你可以像这样设置查询参数和 # 片段：

You can set query params and fragment as follows:

      
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      <a [routerLink]="['/user/bob']" [queryParams]="{debug: true}" fragment="education">
  link to user component
</a>
    

RouterLink 将会使用它们生成如下链接：/user/bob#education?debug=true。

RouterLink will use these to generate this link: /user/bob?debug=true#education.

（从 v4.0.0 中开始已废弃，请用 queryParamsHandling 来代替）你还可以告诉该指令保留当前的查询参数（?）和 # 片段：

(Deprecated in v4.0.0 use queryParamsHandling instead) You can also tell the directive to preserve the current query params and fragment:

      
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      <a [routerLink]="['/user/bob']" preserveQueryParams preserveFragment>
  link to user component
</a>
    

你可以告诉该指令要如何处理查询参数，有效的选项包括：

You can tell the directive how to handle queryParams. Available options are:

• 'merge'：把老的查询参数合并进新的查询参数中

  'merge': merge the queryParams into the current queryParams

• 'preserve'：保持当前的查询参数

  'preserve': preserve the current queryParams

• 默认 / ''：只使用当前查询参数

  default/'': use the queryParams only

这个选项和 NavigationExtras#queryParamsHandling 的一样。

Same options for NavigationExtras#queryParamsHandling.

      
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      <a [routerLink]="['/user/bob']" [queryParams]="{debug: true}" queryParamsHandling="merge">
  link to user component
</a>
    

You can provide a state value to be persisted to the browser's History.state property (See https://developer.mozilla.org/en-US/docs/Web/API/History#Properties). It's used as follows:

      
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      <a [routerLink]="['/user/bob']" [state]="{tracingId: 123}">
  link to user component
</a>
    

And later the value can be read from the router through router.getCurrentNavigation. For example, to capture the tracingId above during the NavigationStart event:

      
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      // Get NavigationStart events
router.events.pipe(filter(e => e instanceof NavigationStart)).subscribe(e => {
  const navigation = router.getCurrentNavigation();
  tracingService.trace({id: navigation.extras.state.tracingId});
});
    

RouterLink 指令总是把新提供的输入看作是对当前 URL 的增量修改。

The router link directive always treats the provided input as a delta to the current url.

例如，如果当前 url 是 /user/(box//aux:team)，

For instance, if the current url is /user/(box//aux:team).

那么 <a [routerLink]="['/user/jim']">Jim</a> 生成的链接将是 /user/(jim//aux:team)。

Then the following link <a [routerLink]="['/user/jim']">Jim</a> will generate the link /user/(jim//aux:team).

欲知详情，参见 createUrlTree。

See createUrlTree for more information.