js 读写 cookie 简单实现

const getItem = key => {
  let ca = document.cookie.split('; ');
  for (let i = 0; i < ca.length; i++) {
    let item = ca[i].split('=');
    if (item[0] === key) {
      return item[1];
    }
  }

  return '';
}

const setItem = (key, value, second = 86400) => {
  let d = new Date();
  d.setTime(d.getTime() + (second * 1000))
  let expires = 'expires=' + d.toUTCString();
  document.cookie = key + '=' + value + ';' + expires;
}

const deleteItem = key => {
  setItem(key, '', -1)
}