localStorage 设置过期时间

设置localStorage过期时间方法。

/****
* name:localStorage的key
* data:localStorage的Value
* expire:localStorage的过期时间,默认是1天后过期
****/
//设置缓存
const localStorageSet = (name, data, expire = new Date().getTime() + expire * 60 * 60 * 1000) => {
  const obj = {
    data,
    expire
  };
  localStorage.setItem(name, JSON.stringify(obj));
};

//读取缓存
const localStorageGet = name => {
  const storage = localStorage.getItem(name);
  const time = new Date().getTime();

  let result = {};
  if (storage) {
    const obj = JSON.parse(storage);
    if (time < obj.expire) {
      result = obj.data;
    } else {
      localStorage.removeItem(name);
    }
  }
  return result;
};

使用：

设置过期时间为第2天凌晨。

let expire = new Date(new Date().setDate(new Date().getDate() + 1)).setHours(0, 0, 0, 0);
localStorageSet('popup', {
    showOnce: true,
}, expire);