For example you can say your buttons are 20% lighter than your background color and use variables and functions to drive the entire styling of your app - rather than having to do it all by hand.
比如说，你可以说按钮的颜色比背景色淡20%，并使用变量与函数来驱动应用的全部样式——而不必手工编写全部样式。
You can specify the text, the number of buttons, and the button contents in an alert, but you can't customize the background appearance of the alert itself.
你可以在一个警告窗口中指定文本，按键的数量以及按键的内容，但你不能自定义警告窗口本身背景的显示。
Release - the third button does not reset the background color of the buttons until the mouse is pressed and released in the button.
释放-第三个按钮不会重置按钮的背景色，除非在该按钮上按下和释放鼠标。
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