如何获取router.back传递的参数

import { router } from '@kit.ArkUI'; 
 
class InfoTmp { 
  age: number = 0 
} 
 
class RouTmp { 
  id: object = () => { 
  } 
  info: InfoTmp = new InfoTmp() 
} 
 
const params: RouTmp = router.getParams() as RouTmp; // 获取传递过来的参数对象 
const id: object = params.id // 获取id属性的值 
const age: number = params.info.age // 获取age属性的值