lovecoding
/
VIP20


			
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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  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()

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


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