function setCookie(name,value){               //JS写入COOKIE
  var Days = 1;   //此 cookie 将被保存 1 天   
  var exp = new Date();
    exp.setTime(exp.getTime() + Days*24*60*60*1000);
    document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString();
}
function getCookie(name){                      //JS读取COOKIE
  var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
  if(arr=document.cookie.match(reg)) return unescape(arr[2]);
  else return null; 
}
function delCookie(name){                     //JS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();
  alert("COOKIE清理成功!\n"+name+" 的COOKIE值:"+cval);
}