存一个有效期为7天的cookie，key = nickname, val = Ace

存一个有效期为7天的cookie，key = nickname, val = Ace

function setCookie(key, val, expires) {
let now = new Date()
now.setDate(now.getDate() + expires)
document.cookie = ${key}=${val};expires=${now.toUTCString()}
}

     function removeCookie(key) {
         setCookie(key, null, -1)
     }

     setCookie('count', 22, 7)
      setCookie('age1', 33, 2)
     removeCookie('age1')
     console.log(document.cookie);

     function getCookie(key) {
         let obj = {}
         let cookies = document.cookie.split('; ')
         cookies.forEach(r => {
             let kv = r.split('=')
             let key = kv[0]
             let val = kv[1]
             obj[key] = val
         })
         if (key) return obj[key]
         return obj
     }

     console.log(getCookie());
     console.log(getCookie('age'));
     console.log(getCookie('username'));