如何实现将JSON字符串转化为特定对象？

class TestAdModel{ 
  name:string 
  constructor(v:string) { 
    this.name = v 
  } 
} 
  
let model :TestAdModel = new TestAdModel('boyan'); 
  
let modelstr:string = JSON.stringify(model); 
let model2 : TestAdModel = JSON.parse(modelstr); 
  
console.log("model instanceof TestAdModel= "+(model instanceof TestAdModel)); 
console.log("model2 instanceof TestAdModel= "+(model2 instanceof TestAdModel)); 
console.log(model2.name); 
  
// OutPut 
//model instanceof TestAdModel= true 
//model2 instanceof TestAdModel= false 
//boyan