Javascript 建立、讀取、刪除cookie值

Javascript/Jquery 建立、讀取、刪除cookie值
https://n.sfs.tw/content/index/10319

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// 建立cookie function createCookie(name, value, days, path) {   if (days) {     var date = new Date();     date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));     var expires = "; expires=" + date.toGMTString();   }   else var expires = "";   document.cookie = name + "=" + value + expires + "; path=/"; } //讀取 function readCookie(name) {    var nameEQ = name + "=";    var ca = document.cookie.split(';');    for (var i = 0; i < ca.length; i++) {       var c = ca[i];       while (c.charAt(0) == ' ') c = c.substring(1, c.length);       if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);    }    return null; } //刪除 function eraseCookie(name) {    createCookie(name, "", -1); }

使用範例：
讀取
   ds= readCookie('showadv');

建立(有效3日)
  var ds="some value";
  createCookie('showadv', ds, 3);

刪除(等於建立一個逾期的cookie)
  eraseCookie('showadv');