@nils解释得很清楚。

接下来呢?

我只是回到使用相对'经典' %(百分比)在CSS。

实现一些东西通常比使用vh更费力，但至少，你有一个相当稳定的解决方案，它可以跨不同的设备和浏览器工作，没有奇怪的UI故障。

对我来说，这种把戏成了一种工作:

height: calc(100vh - calc(100vh - 100%))

在我的应用程序，我这样做(typescript和嵌套postcss，所以改变相应的代码):

const appHeight = () => {
    const doc = document.documentElement
    doc.style.setProperty('--app-height', `${window.innerHeight}px`)
}
window.addEventListener('resize', appHeight)
appHeight()

在你的css中:

:root {
    --app-height: 100%;
}

html,
body {
    padding: 0;
    margin: 0;
    overflow: hidden;
    width: 100vw;
    height: 100vh;

    @media not all and (hover:hover) {
        height: var(--app-height);
    }
}

它至少可以在chrome手机和ipad上运行。不工作的是，当你添加你的应用程序到iOS的主屏幕上，并改变方向几次-以某种方式缩放级别混乱的innerHeight值，我可能会发布一个更新，如果我找到一个解决方案。

Demo

我在下面创建了两个例子:

要展示如何高度:100vh的高度可以导致滚动在移动chrome浏览器:

代码:https://codesandbox.io/embed/mobile-viewport-100vh-issue-nxx8z?fontsize=14&hidenavigation=1&theme=dark

演示:https://nxx8z.csb.app/

解决方案使用位置:固定解决问题和纯CSS:

代码:https://codesandbox.io/s/mobile-viewport-100vh-issue-fix-forked-ypx5x?file=/index.html

演示:https://ypx5x.csb.app/

不幸的是，这是故意的……

这是一个众所周知的问题(至少在safari mobile中)，这是故意的，因为它可以防止其他问题。Benjamin Poulain回复了一个webkit漏洞:

This is completely intentional. It took quite a bit of work on our part to achieve this effect. :) The base problem is this: the visible area changes dynamically as you scroll. If we update the CSS viewport height accordingly, we need to update the layout during the scroll. Not only that looks like shit, but doing that at 60 FPS is practically impossible in most pages (60 FPS is the baseline framerate on iOS). It is hard to show you the “looks like shit” part, but imagine as you scroll, the contents moves and what you want on screen is continuously shifting. Dynamically updating the height was not working, we had a few choices: drop viewport units on iOS, match the document size like before iOS 8, use the small view size, use the large view size. From the data we had, using the larger view size was the best compromise. Most website using viewport units were looking great most of the time.

Nicolas Hoizey对此做了很多研究:https://nicolas-hoizey.com/2015/02/viewport-height-is-taller-than-the-visible-part-of-the-document-in-some-mobile-browsers.html

没有修复计划

在这一点上，除了避免在移动设备上使用视口高度之外，你没有什么可以做的。Chrome在2016年也变成了这样:

https://groups.google.com/a/chromium.org/forum/ !主题/ blink-dev / BK0oHURgmJ4 https://developers.google.com/web/updates/2016/12/url-bar-resizing

您可以通过添加以下脚本和样式来做到这一点

function appHeight() {
  const doc = document.documentElement
  doc.style.setProperty('--vh', (window.innerHeight*.01) + 'px');
}

window.addEventListener('resize', appHeight);
appHeight();

风格

.module {
  height: 100vh; /* Fallback for browsers that do not support Custom Properties */
  height: calc(var(--vh, 1vh) * 100);
}