document.cookie

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/**
 * set the cookie
 * @param {String} name
 * @param {String} value
 * @param {Number} day
 */
let setCookie = (name, value, day) => {
  let date = new Date()
  date.setDate(date.getDate() + day)
  document.cookie = name + "=" + value + ";expires=" + date
}

/**
 * get the cookie by name
 * @param {String} name
 */
let getCookie = (name) => {
  let str = document.cookie.split("; ").filter((i) => {
    let result = i.split("=")
    return result[0] == name
  })
  return str.length ? str[0].split("=")[1] : ""
}

/**
 * check user
 */
let checkCookie = () => {
  let username = document.cookie ? getCookie("username") : ""
  if (username != "") {
    alert("Welcome " + username)
  } else {
    username = prompt("please input your username")
    if (username && username != "") {
      setCookie("username", username, 7)
    }
  }
}

checkCookie()
console.log(getCookie("username"))