cookie

 cookie

 cookie

 

• 服务器用来在客户端存储一些数据,比如用户信息
• 量小 4kb
• 1-设置cookie

   document.cookie = "username=aaa";
          document.cookie = "pass=123";
          var date = new Date();
          date.setSeconds(date.getSeconds() + 10);
          //设置cookie 及过期时间
          //document.cookie = "username=aaa;expires=" + date;
          
          封装设置cookie方法：
          function setCookie(cName, cValue, day) {
              var date = new Date();
              date.setDate(date.getDate() + day);
              document.cookie = cName + '=' + cValue + ';expires=' + date;
          }
          setCookie('username', 'aaa', 1);
          setCookie('pass', '123', 1);

• 2-获取cookie

    var c = document.cookie;
      console.log(c); //'username=aaa; pass=123'
  
      封装获取cookie的方法：
      function getCookie(cName) {
          var cookieObj = {};
          var cstring = document.cookie; //'username=aaa; pass=123; city=bbb'  --> {username:aaa,pass:123}
          var ary = cstring.split('; '); //['username=aaa','pass=123']
          for (var i = 0; i < ary.length; i++) {
              var ary1 = ary[i].split('=');
              cookieObj[ary1[0]] = ary1[1];
          }
          return cookieObj[cName];
      }
  
      var v = getCookie('pass');
      console.log(v);

• 3-删除cookie

      /* 删除cookie :原理就是把过期时间设置为前一天*/
      function removeCookie(cName) {
          setCookie(cName, 1, -1);
      }
      removeCookie('username');

参考资料：  https://www.cnblogs.com/bq-med/p/8603664.html