本例实现了从网页中提取天气预报信息的功能。运行程序，选择列表中的城市后，单击“获取”按钮后，该城市的天气预报信息将显示在列表中。-Achieved in this case to extract weather information from the web page functionality. Run the program, the city selection list, click the " Get" button, the city' s weather