The following article is shared with you about mobile terminal adaptation rem.js, which has a certain reference value. Friends in need can refer to it
Mobile terminal web page adaptation It is a troublesome thing. Common methods include media query, js control, etc.
Personally, I feel that media query is redundant and can be used in small quantities. I prefer js to control it.
The following is my own summary of rem. js:
(function(doc, win) {
// html元素字体
// 这里基础字体设置为10在uc, WX上没效果, 不知道为什么
// 设置为10时, dpr=1的手机, 宽度360, 计算出来html的字体大小为5px, 可能是字体太小了
// 尽量设置大一些, 这样避免12px字体大小的限制
var _rootFontSize = window._rootFontSize || 25; // 默认不支持缩放
var _remMetaScalable = typeof window._remMetaScalable === 'undefined'
? false
: !!window._remMetaScalable; var docEl = doc.documentElement,
isIOS = navigator.userAgent.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), // 只针对IOS设备
dpr = isIOS ? Math.min(win.devicePixelRatio, 3) : 1, // 计算缩放比
scale = 1 / dpr, // 检测支持的"缩放"事件
resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize';
docEl.dataset.dpr = dpr; // 被iframe引用时，禁止缩放
dpr = window.top === window.self ? dpr : 1; var metaEl = doc.createElement('meta');
metaEl.name = 'viewport'; var metaElContent = 'width=device-width, '; // 支持缩放
if (_remMetaScalable) {
metaElContent += 'initial-scale=' + scale;
} else {
metaElContent += ( 'initial-scale=' + scale
+ ',maximum-scale=' + scale
+ ', minimum-scale=' + scale
+ ', user-scalable=no');
}
metaEl.content = metaElContent;
docEl.firstElementChild.appendChild(metaEl); // 缩放/旋转设备检测函数
var recalc = function() {
var width = docEl.clientWidth; // 750为设计用的宽度, 比如它以iphone6标准(宽750)
// 此时, 按照设计稿的尺寸写就可以了
// 如: 设计稿为100px, 那么就写4rem(100 / 25), 25是自己设置的
// 也可以设置成100, 这样就写100px就写1rem
docEl.style.fontSize = _rootFontSize * (width / 750) + 'px';
};
recalc(); if (!doc.addEventListener) return;
win.addEventListener(resizeEvt, recalc, false);
})(document, window);Usage example:
<!DOCTYPE html><html lang="zh-CN"><head><meta charset="utf-8"><meta name="viewport"
content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=no"><title>rem</title><style type="text/css">
.c1 { border: 2px solid black; font-size: 32px; }
.c2 { border: 2px solid black; font-size: 1.28rem; }
.c3 { border: 1px solid black; font-size: 1.28rem; }</style><script type="text/javascript" src="rem.js"></script></head><body>
<pre class="c1">
.c1 {
border: 2px solid black;
font-size: 32px;
}
.c2 {
border: 2px solid black;
font-size: 1.28rem;
}
.c3 {
border: 1px solid black;
font-size: 1.28rem;
}