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



 function deleteCookie(name) {
     var exp = new Date(); //当前时间 
     exp.setTime(exp.getTime() - 1000);
     var cval = getck(name);
     if (cval != null) document.cookie = name + "=;path=/;expires=" + exp.toGMTString(); 
 }
    //保存用户登陆信息
 function setCookie(name, value) { 
      var Days = 1;
      var exp = new Date();   
      exp.setTime(exp.getTime() + Days*24*60*60*1000); //换成毫秒
      document.cookie = name + "=" + escape(value) + ";path=/"; // + ";expires=" + exp.toGMTString(); 
   }