JS操作COOKIE实现备忘记录的方法

function getCookie(c_name){  if (document.cookie.length > 0)  {    c_start = document.cookie.indexOf(c_name + "=");    if (c_start!=-1)    {       c_start = c_start + c_name.length + 1;      c_end = document.cookie.indexOf(";", c_start);      if (c_end == -1)      {        c_end = document.cookie.length;      }      return unescape(document.cookie.substring(c_start,c_end))    }  }  return ""}function setCookie(c_name,value,expiredays){  var exdate = new Date();  exdate.setDate(exdate.getDate() + expiredays);  document.cookie=c_name+ "=" + escape(value) +  ((expiredays==null) ? "" : ";expires="+exdate.toGMTString());}