Pixel 2 CM转换Javascript
[英]Pixel 2 CM convert Javascript
问题描述
i must convert px to cm with javascript 
我必须使用javascript将px转换为cm
oneCM= 37.795276 is it true everytime? oneCM = 37.795276每次都是真的吗？
What is the DPI's role here? DPI在这里的作用是什么？
and if is variable CM on the monitor (factor DPI) how can we find DPI's 如果显示器上的CM为变量（DPI因子），我们如何找到DPI
1 个解决方案
解决方案1
1 已采纳 2012-10-09 14:47:04
Do you want DPI or PPI? 您要DPI还是PPI？ - DPI is for printing, PPI for screens. -DPI用于打印，PPI用于屏幕。
If you are talking about the "real" size of an image or a webpage on your screen we're talking about PPI. 如果您正在谈论屏幕上图像或网页的“实际”尺寸，那么我们在谈论PPI。 Common PC screens have approx. 普通的PC屏幕大约有 80ppi, the macbook pro has 220ppi. 80ppi，macbook pro为220ppi。
If you want to convert those, you first have to convert your wanted size from cm to inches and then multiply it with the wanted ppi. 如果要转换这些尺寸，则必须首先将所需尺寸从cm转换为英寸，然后将其乘以所需的ppi。
1cm = 0.39inches
0.39inches * 80dpi = 31.5px
Vice versa: 反之亦然：
900px / 80ppi = 11.25inches
11.25inches = 28.575cm
The same works with DPI for printing. DPI用于打印也是如此。 You have to know the DPI of your printer (common printes have 72dpi, commercial printers have something between 150 - 600dpi). 您必须知道打印机的DPI（普通打印为72dpi，商用打印机的DPI在150-600dpi之间）。
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