HTML DOM deviceYDPI 属性定义和用法语法实例HTML DOM deviceYDPI 属性定义和用法deviceYDPI 属性返回显示屏幕的每英寸垂直点数。 语法screen.deviceYDPI 实例<html> <body><script type="text/javascript">document.write("<p>Device YDPI: ")document.write(screen.deviceYDPI + "</p>")</script></body> </html>