步步为营：Asp.Net客户端存Cookie服务端取

function Cookies(name, value, options) {
    if (typeof value != 'undefined') { // name and value given, set cookie
        options = options || {};
        if (value === null) {
            value = '';
            options.expires = -1;
        }
        var expires = '';
        if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
            var date;
            if (typeof options.expires == 'number') {
                date = new Date();
                date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
            } else {
                date = options.expires;
            }
            expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
        }
        var path = options.path ? '; path=' + (options.path) : '/';
        var domain = options.domain ? '; domain=' + (options.domain) : '';
        var secure = options.secure ? '; secure' : '';
        document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
    } else { // only name given, get cookie
        var cookieValue = null;
        if (document.cookie && document.cookie != '') {
            var cookies = document.cookie.split(';');
            for (var i = 0; i < cookies.length; i++) {
                var cookie = cookies[i].replace(/^\s+|\s+$/g, "");
                // Does this cookie string begin with the name we want?
                if (cookie.substring(0, name.length + 1) == (name + '=')) {
                    cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
                    break;
                }
            }
        }
        return cookieValue;
    }
}

这是一个存入Cookie和获取的函数

调用：第一个参数键名，第二个参数值，第三个参数 路径和过期时间

Cookies("val", str, { path: '/', expires: 10 });

到了.Net里，因为我在后台写Cookie都是指定某个域下的，如果是要获取前台的path '/' 就不指定

获取域中的Cookie

/// <summary>
/// 获得cookie值
/// </summary>
/// <param name="strName">项</param>
/// <returns>值</returns>
public static string GetCookie(string strName)
{
   if (HttpContext.Current.Request.Cookies != null && HttpContext.Current.Request.Cookies["shikee.com"] != null &&

　　　　HttpContext.Current.Request.Cookies["shikee.com"][strName] != null)
   {
      return Utils.UrlDecode(HttpContext.Current.Request.Cookies["shikee.com"][strName].ToString());
   }

   return null;
}

不指定shikee.com域

传入的strName就是JS传入的键名，这样就找到path为"/"下的Cookie

public static string GetCookie_path(string strName)
{
    if (HttpContext.Current.Request.Cookies != null && HttpContext.Current.Request.Cookies[strName] != null)
    {
        Encoding encoding = Encoding.GetEncoding("UTF-8");
        return HttpUtility.UrlDecode(HttpContext.Current.Request.Cookies[strName].Value, encoding);
    }
    return null ;
}