问Angular2中的路径参数

EN

let url = new URL(`api/v1/something/${id}/etc/${name}/and/so/on`);

export interface PathParameters {
  [parameterName: string]: string;
}

export class Url {

  public static create(url: string, parameters: PathParameters) {
    const placeholders = url.match(/({[a-zA-Z]*})/g);
    placeholders.forEach((placeholder: string) => {
      const key = placeholder.substr(1, placeholder.length - 2);
      const value = parameters[key];
      if (!value) {
        throw new Error(`parameter ${key} was not provided`);
      }
      url = url.replace(placeholder, encodeURIComponent(value));
    });
    return url;
  }

}

const url = Url.create('/api/cars/{carId}/parts/{partId}', {
    carId: carId,
    partId: partId
  });