(JS)筛选出对象中value大于2的key

var obj = {
    "a":1,
    "b":2,
    "c":3,
    "d":4,
    "e":5,
    "f":6
  }
  let c = Object.values(obj);
  let key = Object.keys(obj);
  let x = key.filter(item=>{
    return obj[item]>2;
  });