位置等級

位置是應用程式可用於與瀏覽器的 URL 進行互動的服務。根據使用的 LocationStrategy，Location 將持久儲存到 URL 的路徑或 URL 的雜湊段。

Location 負責根據應用程式的基本 href 規範化 URL。

import {Component} from '@angular/core';
import {Location} from '@angular/common';

@Component({
    selector: 'app-component'
})
class AppCmp {

  constructor(_location: Location) {

    //Changes the browsers URL to the normalized version of the given URL, 
    //and pushes a new item onto the platform's history.
    _location.go('/foo');

  }

  backClicked() {
    //Navigates back in the platform's history.
    this._location.back();
  }

  forwardClicked() {
    //Navigates forward in the platform's history.
    this._location.back();
  }
}