您可以使用 JavaScript 检测 -moz-device-pixel-ratio 和 -o-device-pixel-ratio 的当前值吗？
WebKit 引入了 -webkit-device-pixel-ratio 媒体功能和 window.devicePixelRatio JavaScript 属性，以允许 Web 作者检测其页面是否在 iPhone 上呈现视网膜显示屏：
- https://developer.apple.com/library/archive/documentation/AppleApplications/Reference/SafariCSSRef/Articles/OtherStandardCSS3Features.html#//apple_ref/doc/uid/TP40007601-SW3
- http://www.robertprice.co.uk/robblog/archive/ 2011/5/Detecting_Retina_Displays_From_JavaScript_And_CSS.shtml
Mozilla 和 Opera 引入了等效媒体功能，-moz-device-pixel-ratio 和 -o-device-pixel-ratio。然而，他们似乎没有引入 JavaScript 属性来配合它们。
有没有办法通过 Firefox 和 Opera 中的 JavaScript 检测设备像素比？
WebKit introduced the -webkit-device-pixel-ratio media feature and window.devicePixelRatio JavaScript property, to allow web authors to detect whether their page was being rendered on an iPhone with a retina display:
- https://developer.apple.com/library/archive/documentation/AppleApplications/Reference/SafariCSSRef/Articles/OtherStandardCSS3Features.html#//apple_ref/doc/uid/TP40007601-SW3
- http://www.robertprice.co.uk/robblog/archive/2011/5/Detecting_Retina_Displays_From_JavaScript_And_CSS.shtml
Mozilla and Opera have introduced equivalent media features, -moz-device-pixel-ratio and -o-device-pixel-ratio. However, they don’t seem to have introduced the JavaScript property to go along with them.
Is there any way to detect the device pixel ratio via JavaScript in Firefox and Opera?
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您可以使用 https://developer.mozilla.org/en/DOM 从 JS 测试媒体功能/window.matchMedia
You can test media features from JS using https://developer.mozilla.org/en/DOM/window.matchMedia