求大佬告知如何遍历JSON对象

let jsonMap: Map<string, string | number> = new Map<string, string | number>(); 
JSON.parse('{ "0": {"num": 1}, "1": {"num": 2} }', (k, v) => { 
  if (k != '') { 
    jsonMap.set(k, v as string | number) 
  } 
  return jsonMap; 
})