NavPathStack对象可以在class中获取并且使用吗？

export class NewsNormalDetailController{  
  pageInfos:NavPathStack  
  constructor(pageInfos:NavPathStack) {  
    this.pageInfos = pageInfos  
  }  
  images(args: string) {  
    this.pageInfos.pushPathByName('Page01', null)  
    console.log('imageimageimageimage'+JSON.stringify(this.pageInfos))  
  }  
}