/// <summary>
/// 获取二维码
/// </summary>
public WebWeChat()
{
cookie = "";
string s = Encoding.Default.GetString(HttpHelps.GetQr("https://login.weixin.qq.com/jslogin?appid=wx782c26e4c19acffb&redirect_uri="));
uuid = function.middlestring(s, "window.QRLogin.uuid = \"", "\";");
QrCode = "https://login.weixin.qq.com/qrcode/" + uuid;
}