//获得coolie 的值

 function cookie(name) {

     var cookieArray = document.cookie.split("; "); //得到分割的cookie名值对

     var cookie = new Object();

     for (var i = 0; i < cookieArray.length; i++) {

         var arr = cookieArray[i].split("=");       //将名和值分开

         //如果是指定的cookie，则返回它的值

         if (arr[0] == name) {

             return unescape(arr[1]);

         }

     }

     return "";

 }

 function delCookie(name)//删除cookie

 {

     document.cookie = name + "=;expires=" + (new Date(0)).toGMTString();

 }

 function getCookie(objName) {//获取指定名称的cookie的值

     var arrStr = document.cookie.split("; ");

     for (var i = 0; i < arrStr.length; i++) {

         var temp = arrStr[i].split("=");

         if (temp[0] == objName) return unescape(temp[1]);

     }

 }

 function addCookie(objName, objValue, objHours) {      //添加cookie

     var str = objName + "=" + escape(objValue);

     if (objHours > 0) {                               //为时不设定过期时间，浏览器关闭时cookie自动消失

         var date = new Date();

         var ms = objHours * 3600 * 1000;

         date.setTime(date.getTime() + ms);

         str += "; expires=" + date.toGMTString();

     }

     document.cookie = str;

 }

 function SetCookie(name, value)//两个参数，一个是cookie的名子，一个是值

 {

     var Days = 30; //此 cookie 将被保存 30 天

     var exp = new Date();    //new Date("December 31, 9998");

     exp.setTime(exp.getTime() + Days * 24 * 60 * 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();

     }

 }