JavaScript 实现 Cookie 控制弹窗显示

Cookie 封装与调用实现

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title></title>
</head>
<body>

<script>

  var cookie = {
    setCookie:function(name,value,iDay){
      var cookieStr = '';
      if(iDay == undefined){
        cookieStr += name+'='+value+';';
      }else{
        var oDate = new Date();
        oDate.setDate(oDate.getDate()+iDay);
        cookieStr += name+'='+value+';express='+oDate;
      }

      document.cookie = cookieStr;
    },
    getCookie:function(name){
      var arr = document.cookie.split(';');
      for(var i=0;i<arr.length;i++){
        var arr2 = arr[i].split('=');
        if(arr2[0] == name){
          return arr2[1];
        }
      }
      return '';
    },
    removeCookie:function(name){
      this.setCookie(name,'1',-1);
    }
  }

  function ControlAlert(){
    var flag = cookie.getCookie('flag');
    if(!flag){
      alert("我是第一次加载的哟！");
      cookie.setCookie('flag',true);
      //cookie.setCookie('flag',true,1);//如果有第三个参数则保存cookie的天数，如果不设置，浏览器关闭时cookie过期
    }
  }

  (function(){
    ControlAlert();
  }());

</script>
</body>
</html>