在html在添加cookie和读取cookie

1.保存cookie

 var oDate = new Date();
 oDate.setDate(oDate.getDate() + );//有效期为30天
 document.cookie = "name=www.wzh.com;expires=" + oDate;

2.读取cookie

var res = document.cookie.substring();
if (res != "www.wzh.com") {
   alert("没有cookie信息");
}