The screen object contains information about the visitor's screen.
注: There is no public standard that applies to the screen object, but all major browsers support it.
|availHeight||Returns the height of the screen (excluding the Windows Taskbar)|
|availWidth||Returns the width of the screen (excluding the Windows Taskbar)|
|colorDepth||Returns the bit depth of the color palette for displaying images|
|height||Returns the total height of the screen|
|pixelDepth||Returns the color resolution (in bits per pixel) of the screen|
|width||Returns the total width of the screen|