It makes a difference if you loop through 500 or 5000 DOM elements on the page when you want to add an event handler for example.

如果您依次通过页上的500或5000 DOM元素，当您要添加事件处理程序，例如，它使不同。

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The skeleton of an application consists of just four steps: (1) create an application; (2) create one or more Windows; (3) add some widgets to the Windows; (4) call the app.run event-loop.

应用程序的主框架只由四个步骤组成：(1)创建一个应用程序；(2)创建一个或多个窗口；(3)在窗口中添加一些窗口小部件；(4)调用app . run事件循环。

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