lovecoding
/
VIP22


			
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							<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    /* 
    cookie 本地存储 大小 4K  默认的有效期 为当前对话窗口  
    可以通过 expires 设置过期时间
    */
    document.cookie = "name = 'zs'"
    var date = new Date()
    
    date.setDate(date.getDate() + 1)
    console.log(date)
    console.log(date.toUTCString())

    document.cookie = "password = '123';expires="+date.toUTCString()


    function setCookie (key,value,expires){
      var date = new Date()
      date.setDate(date.getDate()+expires)
      document.cookie = key + '=' +value + ';expires=' + date.toUTCString()
    }
    setCookie('age',18,2)


    function getCookie(key){
      var cookie = document.cookie
      console.log(cookie)
      /* 创建一个arr 存放字符串分开 
      .split() 把字符串 拆分成数组
      ["password='123'", " name='zs'", ' age=18']
      */
      var arr = cookie.split(';')
      console.log(arr)
      for(var i=0;i<arr.length;i++){
        var tmp = arr[i].split('=')
        console.log(tmp)
        /* trim()用于删除字符串的头尾空白 */
        if(tmp[0].trim() == key){
          return tmp[1]
        }
      }
    }
    console.log(getCookie('age'))


    function delCookie(key){
      var date = new Date()
      date.setDate(date.getDate()-1)
      document.cookie = key+ '=null;expires='+ date.toUTCString()
    }
    delCookie('age')
  </script>
</body>
</html>