HTML DOM Screen 对象
bufferDepth 属性设置或返回在 off-screen bitmap buffer 中调色板的比特深度。
screen.bufferDepth=number
<html> <body> <script type="text/javascript"> document.write("<p>Buffer Depth: ") document.write(screen.bufferDepth + "</p>") </script> </body> </html>
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