单个名称-值会针对每个文本框、密码和隐藏字段添加。
A single name-value pair is added for every text box, password, or hidden field.
这项功能经常被忽略，并且密码文本框只记录按键事件而忽略释放事件。
Most often this feature is ignored, and password text boxes simply record key-press events and ignore key-release events.
在循环完成后，另一套画布、密码文本框和Submit按钮将被创建并封装到t k主窗口中。
After the loop, another canvas, password text box, and Submit button are created and packed into the Tk main window.
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