const obj = {
  A:'hy',
  B:12
};
console.log(Object.entries(obj)) // [[‘A’,'hy'],[‘B',12]]

for(let [key, value] of Object.entries(obj)){
     console.log(`${key}:${value}`) // A:hy  B:12
}

将Object转换为Map

const obj = {
  A:'hy',
  B:12
};
const map = new Map(Object.entries(obj))
console.log(map) // Map { A:’hy’ , B:12 }