前台

//存入cookie
function setCookie(name,value){
  var Days = 30;
  var exp = new Date();
  exp.setTime(exp.getTime() + Days*24*60*60*1000);
  document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}
//获取cookie
function getCookie(name){
  var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
  if(arr=document.cookie.match(reg))
  return unescape(arr[2]);
  else
 return null;
}