模拟 localStorage 时如何实现过期时间功能

function get(name) {
const record = JSON.parse(localStorage.getItem(name));
return record.time - Date.now() > 0 ? record: localStorage.removeItem('record');
}

function set(value) {
let record = {
time: Date.now() + 5000,
result: value
}
localStorage.setItem('record', JSON.stringify(record));
}