当用户把鼠标移到DOM元素上时，指令将该元素的背景设置为一个高亮颜色。
The directive sets the background to a highlight color when the user mouses over the DOM element to which it is applied.
返回系统颜色用于显示文本背景高亮。
Returns the system color used for displaying text on a light background.
返回系统颜色用于显示文本背景高亮。
Returns the system color used for displaying text on a light background.
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