感谢 Vincent 的努力和 Joey Hayes 的工作，我有这个 codepen 在支持多个固定背景的 Android 手机上工作
HTML：
<html>
<body>
<nav>Nav to nowhere</nav>
<article>
<section class="bg-img bg-img1">
<div class="content">
<h1>Fixed backgrounds on a mobile browser</h1>
</div>
</section>
<section class="solid">
<h3>Scrolling Foreground Here</h3>
</section>
<section>
<div class="content">
<p>Quid securi etiam tamquam eu fugiat nulla pariatur. Cum ceteris in veneratione tui montes, nascetur mus. Quisque placerat facilisis egestas cillum dolore. Ambitioni dedisse scripsisse iudicaretur. Quisque ut dolor gravida, placerat libero vel,
euismod.
</p>
</div>
</section>
<section class="solid">
<h3>Scrolling Foreground Here</h3>
</section>
<section class="footer">
<div class="content">
<h3>The end is nigh.</h3>
</div>
</section>
</article>
</body>
CSS：
* {
box-sizing: border-box;
}
body {
font-family: "source sans pro";
font-weight: 400;
color: #fdfdfd;
}
body > section >.footer {
overflow: hidden;
}
nav {
position: fixed;
top: 0;
left: 0;
height: 70px;
width: 100%;
background-color: silver;
z-index: 999;
text-align: center;
font-size: 2em;
opacity: 0.8;
}
article {
position: relative;
font-size: 1em;
}
section {
height: 100vh;
padding-top: 5em;
}
.bg-img::before {
position: fixed;
content: ' ';
display: block;
width: 100vw;
min-height: 100vh;
top: 0;
bottom: 0;
left: 0;
right: 0;
background-position: center;
background-size: cover;
z-index: -10;
}
.bg-img1:before {
background-image: url('https://res.cloudinary.com/djhkdplck/image/upload/v1491326836/3balls_1280.jpg');
}
.bg-img2::before {
background-image: url('https://res.cloudinary.com/djhkdplck/image/upload/v1491326840/icebubble-1280.jpg');
}
.bg-img3::before {
background-image: url('https://res.cloudinary.com/djhkdplck/image/upload/v1491326844/soap-bubbles_1280.jpg');
}
h1, h2, h3 {
font-family: lato;
font-weight: 300;
text-transform: uppercase;
letter-spacing: 1px;
}
.content {
max-width: 50rem;
margin: 0 auto;
}
.solid {
min-height: 100vh;
width: 100%;
margin: auto;
border: 1px solid white;
background: rgba(255, 255, 255, 0.6);
}
.footer {
background: rgba(2, 2, 2, 0.5);
}
JS/JQUERY
window.onload = function() {
// Alternate Background Page with scrolling content (Bg Pages are odd#s)
var $bgImg = $('.bg-img');
var $nav = $('nav');
var winh = window.innerHeight;
var scrollPos = 0;
var page = 1;
var page1Bottom = winh;
var page3Top = winh;
var page3Bottom = winh * 3;
var page5Top = winh * 3;
var page5Bottom = winh * 5;
$(window).on('scroll', function() {
scrollPos = Number($(window).scrollTop().toFixed(2));
page = Math.floor(Number(scrollPos / winh) +1);
if (scrollPos >= 0 && scrollPos < page1Bottom ) {
if (! $bgImg.hasClass('bg-img1')) {
removeBg( $bgImg, 2, 3, 1 ); // element, low, high, current
$bgImg.addClass('bg-img1');
}
} else if (scrollPos >= page3Top && scrollPos <= page3Bottom) {
if (! $bgImg.hasClass('bg-img2')) {
removeBg( $bgImg, 1, 3, 2 ); // element, low, high, current
$bgImg.addClass('bg-img2');
}
} else if (scrollPos >= page5Top && scrollPos <= page5Bottom) {
if (! $bgImg.hasClass('bg-img3')) {
removeBg( $bgImg, 1, 2, 3 ); // element, low, high, current
$bgImg.addClass('bg-img3');
}
}
$nav.html("Page# " + page + " window position: " + scrollPos);
});
}
// This function was created to fix a problem where the mouse moves off the
// screen, this results in improper removal of background image class. Fix
// by removing any background class not applicable to current page.
function removeBg( el, low, high, current ) {
if (low > high || low <= 0 || high <= 0) {
console.log ("bad low/high parameters in removeBg");
}
for (var i=low; i<=high; i++) {
if ( i != current ) { // avoid removing class we are trying to add
if (el.hasClass('bg-img' +i )) {
el.removeClass('bg-img' +i );
}
}
}
} // removeBg()