function setCookie(name,value) { //两个参数，一个是cookie的名子，一个是值
  //var Days = 1; //此 cookie 将被保存 1 天
  var exp  = new Date();
  exp.setTime(exp.getTime() + 60*1000);
  document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}

function getCookie(name) { //取cookies函数
  var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
   if(arr != null) return unescape(arr[2]); return null;
}

function delCookie(name) { //删除cookie
  var exp = new Date();
  exp.setTime(exp.getTime() - 1);
  var cval=getCookie(name);
  if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}