animate函数是动画代码的核心，它用于更改任何随时间变化的数值型的css样式值。

At the heart of the animation code is the animate function, which changes any numeric CSS style value over time.

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层叠样式表给程序员更简单，高效的方式去设计一个网页，它能综合像颜色，圆角边缘，渐变和动画等设计元素让页面看起来更漂亮。

CSS gives programmers aneasy, efficient way to define a web page's layout and beautify the page withdesign elements like colors, rounded corners, gradients, and animation.

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（通配符）状态匹配任何动画状态。当定义那些不需要管当前处于什么状态的样式及转场时，这很有用。比如。

The * ("wildcard") state matches any animation state. This is useful for defining styles and transitions that apply regardless of which state the animation is in. For example.

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