js 深淺拷貝

1.簡單的深拷貝：
 

let deepA = {
    age: 1,
    jobs: {
    first: 'FE'
    }
  };
  let deepB = JSON.parse(JSON.stringify(deepA));
  deepA.jobs.first = 'Ali';
  console.log(deepA.jobs);//Ali
  console.log(deepB.jobs);//FE