高度和宽度以及设备宽度和设备高度有什么区别(简单来说)？
解决方法
设备宽度是…
width of the output device (meaning the entire screen or page,rather than just the rendering area,such as the document window).
宽度…
describes the width of the rendering surface of the output device (such as the width of the document window,or the width of the page Box on a printer)
