苹果的iPad Mini在很多方面都是iPad 2的小复制品。在JavaScript中,是窗口。navigator对象为Mini和iPad 2暴露相同的值。到目前为止,我为检测差异而进行的测试还没有成功。

为什么这很重要?

由于iPad Mini和iPad 2的屏幕像素相同,但实际尺寸(英寸/厘米)不同,它们的PPI(每英寸像素)也不同。

为了提供友好的用户界面,web应用程序和游戏会根据用户的拇指或手指位置调整某些元素的大小,因此,我们可能想要缩放某些图像或按钮以提供更好的用户体验。

到目前为止我尝试过的事情(包括一些非常明显的方法):

window.devicepixelratio CSS元素宽度,单位为cm CSS媒体查询(如分辨率和-webkit-device-pixel-ratio) SVG图形在类似的单位 在设定的时间内进行各种CSS webkit转换,并使用requestAnimFrame计算呈现的帧数(我希望检测到可测量的差异)

我没办法了。你呢?

更新 谢谢你的回复。我想对那些投票反对检测iPad mini和iPad 2的人发表评论,因为苹果有一个规则。好吧,这是我的理由,为什么我觉得知道一个人用的是iPad mini还是iPad 2真的很有意义。随你怎么解释我的推理。

The iPad mini is not only a much smaller device (9.7 inch versus 7.9 inch), but its form factor allows for a different usage. The iPad 2 is usually held with two hands when gaming unless you're Chuck Norris. The mini is smaller, but it is also much lighter and allows for gameplay where you hold it in one hand and use another to swipe or tap or whatnot. As a game designer and developer myself, I'd just like to know if it's a mini so I can choose to provide the player with a different controlscheme if I want (for instance after A/B testing with a group of players).

为什么?事实证明,大多数用户倾向于使用默认设置,所以当玩家第一次加载游戏时,不要使用虚拟拇指杆,而是在屏幕上放置一些基于点击的控制,这是我和其他游戏设计师希望能够做到的。

所以恕我说,这超出了粗手指/指导方针的讨论,这是苹果和所有其他供应商应该做的事情:允许我们唯一地识别你的设备,以不同的方式思考,而不是遵循指导方针。


当前回答

如果你创建了一堆1“x1”宽的div,并将它们一个接一个地附加到父div,直到边界框从1英寸跳到2英寸?mini上的一英寸和iPad上的一英寸是一样大的,对吧?

其他回答

是的,这是一个检查陀螺仪的好点。 你可以很容易地做到

https://developer.apple.com/documentation/webkitjs/devicemotionevent

或者类似的东西

window.ondevicemotion = function(event) {
    if (navigator.platform.indexOf("iPad") != -1 && window.devicePixelRatio == 1) {
        var version = "";
        if (event.acceleration) version = "iPad2";
        else version="iPad Mini";

        alert(version);
    }
    window.ondevicemotion = null;
}​

没有ipad来测试。

那么微基准测试呢,在iPad 2上计算大约需要X微秒,在iPad mini上计算大约需要Y秒。

这可能不够准确,但iPad mini的芯片可能在某些指令上更有效率。

不要补偿iPad mini和iPad 2之间的差异,除非你也补偿了胖手指和瘦手指之间的差异。

Apple appears to be deliberately trying not to let you tell the difference. Apple appears not to want us to write different code for the different size versions of iPads. Not being part of Apple myself, I don't know this for sure, I'm just saying that this is what it appears like. Maybe, if the developer community comes up with a fancy detector for iPad minis, Apple may deliberately break that detector in future versions of iOS. Apple wants you to set your minimum target size to 44 iOS points, and iOS will display that in two sizes, the larger iPad size and the smaller iPhone/iPad mini size. 44 points is plenty generous, and your users will certainly know if they are on the smaller iPad, so can compensate on their own.

I suggest stepping back to your stated reason for asking for the detector: adjusting target size for end user comfort. By deciding to design for one size on the large iPad and another size on the small iPad you are deciding that all people have the same size fingers. If your design is tight enough that the difference in size from an iPad 2 and an iPad mini makes a difference, than the size of fingers between me and my wife will make a bigger difference. So compensate for user finger size, not iPad model.

I have a suggestion on how to measure finger size. I'm a native iOS developer, so I don't know if this can be accomplished in HTML5, but here's how I would measure finger size in a native app. I'd have the user pinch two objects together, then measure how close they get together. Smaller fingers will get the objects closer together, and you can use this measurement to derive a scaling factor. This automatically adjusts for iPad size. The same person will have a larger measurement of on screen points on an iPad mini than on an iPad 2. For a game you can call this a calibration step, or not even call it out. Have it as a starting step. For example in a shooting game have the player put the ammo in the gun with a pinching motion.

没有测试,但它可以不播放音频文件并检查平衡,而是收听麦克风,提取背景噪声,并计算其“颜色”(频率图)。如果IPad Mini的麦克风型号与IPad 2不同,那么它们的背景颜色应该有明显的不同,一些音频指纹识别技术可能会帮助你判断使用的是哪台设备。

我不认为这种方法可行,在这种特殊情况下不值得这么麻烦,但我认为指纹识别背景噪音可以用于某些应用程序,例如,当你在建筑物内时,它可以告诉你你在哪里。

更新:看起来这些值在创建选项卡时报告了视口的宽度和高度,它们在旋转时不会改变,所以这个方法不能用于设备检测!

你可以使用任意一个屏幕。availWidth或screen。availHeight,因为他们似乎是不同的iPad Mini和iPad 2。

iPad迷你

screen.availWidth = 768
screen.availHeight = 1004

iPad 2

screen.availWidth = 748
screen.availHeight = 1024

来源:http://konstruktors.com/blog/web-design/4396-detect-ipad-mini-javascript/