let grade = {
  lilei: 96,
  hanmeimei: 99,
}

// let result = [];
// for (let k in grade) {
//   if (k === "lilei") {
//     result.push(k);
//   }
// }

// console.log(result); // ["lilei"]

// console.log(Object.keys(grade).filter(item => item === "lilei")); // ["lilei"]
// console.log(Object.values(grade).filter(item => item > 96)); // 99
// let result = []
for (let [k, v] of Object.entries(grade)) {
  console.log(k, v)
  // lilei 96
  // hanmeimei 99
}