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
}