如何获取对象的唯一标识(Hash值)

interface Person { 
  name: string, 
  age: number 
} 
let obj: Person = { name: 'Dany', age: 20 }; 
let result1 = util.getHash(obj); 
console.info('result1 is ' + result1); 
let result2 = util.getHash(obj); 
console.info('result2 is ' + result2); 
// 输出：result1 与 result2 的值相等，且为随机的Hash值。