在页面上设置Cookie以每天显示一次引导弹出窗口

Question

我正在学习JavaScript，看到这个问题已经问了很多遍了，但是我无法解决这个问题。 我想做的是，每天显示一次引导程序模式。

到目前为止，我有：

function setCookie(cookiename, cookievalue, expdays) {
  var d = new Date();
  d.setTime(d.getTime()+(expdays * 24 * 60 * 60 * 1000));
  var expires = "expires=" + d.toGMTString();
  document.cookie = cookiename + "=" + cookievalue + "; " + expires;
}

function getCookie(cookiename) {
  var name = cookiename + "=";
  var ca = document.cookie.split(';');
  for(var i = 0; i < ca.length; i++) {
     var c = ca[i].trim();
  if (c.indexOf(name) == 0) return c.substring(name.length, c.length);
}


//I want to check if there is a cookie.
//if I have not set a cookie, I want to show my modal, 
//if there is a cookie then return;
//The cookie should expire in one day. 
function checkCookie() {
   var showed = getCookie("showed");
   if (showed != null && showed != "") {
      var date = new Date(showed).getDate();
      var currentDate = new Date().getDate();

      if (currentDate > date) {
          return true;
      }
       return false;
   }
    return true;
}

现在，如果我将最后一个返回值更改为true； 返回假 我的模态没有显示。 现在，我每次都看到模态。 我究竟做错了什么？ 我怎样才能解决这个问题？

Answer 1

 function setCookie(cookiename, cookievalue, expdays) { var d = new Date(); d.setTime(d.getTime()+(expdays * 24 * 60 * 60 * 1000)); var expires = "expires=" + d.toGMTString(); document.cookie = cookiename + "=" + cookievalue + "; " + expires; } function getCookie(cookiename) { var name = cookiename + "="; var startPos = document.cookie.indexOf(name); if(startPos == -1) return null; startPos+=(name.length); if(document.cookie.indexOf(";",startPos) == -1){ return document.cookie.substring(startPos,document.cookie.length); } else{ return document.cookie.substring(startPos,document.cookie.indexOf(';',startPos)); } return null; } //I want to check if there is a cookie. //if I have not set a cookie, I want to show my modal, //if there is a cookie then return; //The cookie should expire in one day. function checkCookie() { var showed = getCookie("showed"); if (showed != null && showed != "") { var date = new Date(showed).getDate(); var currentDate = new Date().getDate(); if (currentDate > date) { return true; } return false; } return true; } 

另外，在设置Cookie时，请使用

setCookie('showed',new Date().toGMTString(),1);

因为我们使用cookie的值，而不是要检查cookie的过期时间。 因此该值必须是日期字符串