public ChatFrame()
    {
        isSingleChat = false;
        this.targetUser = "";
        
        // ñ
        titleLab = new JLabel("<html><span style='font-weight:bold;font-size:14px;'>Group Chat</span></html>");

        // ʼ
        intiInterface();
        
        // ʼ
        initBasicData();
    }