阿里高清解决方案(仅适用于移动端web)
压缩代码：
<script>!function(e){function t(a){if(i[a])return i[a].exports;var n=i[a]={exports:{},id:a,loaded:!1};return e[a].call(n.exports,n,n.exports,t),n.loaded=!0,n.exports}var i={};return t.m=e,t.c=i,t.p="",t(0)}([function(e,t){"use strict";Object.defineProperty(t,"__esModule",{value:!0});var i=window;t["default"]=i.flex=function(e,t){var a=e||100,n=t||1,r=i.document,o=navigator.userAgent,d=o.match(/Android[\S\s]+AppleWebkit\/(\d{3})/i),l=o.match(/U3\/((\d+|\.){5,})/i),c=l&&parseInt(l[1].split(".").join(""),10)>=80,p=navigator.appVersion.match(/(iphone|ipad|ipod)/gi),s=i.devicePixelRatio||1;p||d&&d[1]>534||c||(s=1);var u=1/s,m=r.querySelector('meta[name="viewport"]');m||(m=r.createElement("meta"),m.setAttribute("name","viewport"),r.head.appendChild(m)),m.setAttribute("content","width=device-width,user-scalable=no,initial-scale="+u+",maximum-scale="+u+",minimum-scale="+u),r.documentElement.style.fontSize=a/2*s*n+"px"},e.exports=t["default"]}]); flex(100, 1);</script>
源码：
'use strict';
/**
* @param {Number} [baseFontSize = 100] - 基础fontSize, 默认100px;
* @param {Number} [fontscale = 1] - 有的业务希望能放大一定比例的字体;
*/
const win = window;
export default win.flex = (baseFontSize, fontscale) => {
const _baseFontSize = baseFontSize || 100;
const _fontscale = fontscale || 1;
const doc = win.document;
const ua = navigator.userAgent;
const matches = ua.match(/Android[\S\s]+AppleWebkit\/(\d{3})/i);
const UCversion = ua.match(/U3\/((\d+|\.){5,})/i);
const isUCHd = UCversion && parseInt(UCversion[1].split('.').join(''), 10) >= 80;
const isIos = navigator.appVersion.match(/(iphone|ipad|ipod)/gi);
let dpr = win.devicePixelRatio || 1;
if (!isIos && !(matches && matches[1] > 534) && !isUCHd) {
// 如果非iOS, 非Android4.3以上, 非UC内核, 就不执行高清, dpr设为1;
dpr = 1;
}
const scale = 1 / dpr;
let metaEl = doc.querySelector('meta[name="viewport"]');
if (!metaEl) {
metaEl = doc.createElement('meta');
metaEl.setAttribute('name', 'viewport');
doc.head.appendChild(metaEl);
}
metaEl.setAttribute('content', `width=device-width,user-scalable=no,initial-scale=${scale},maximum-scale=${scale},minimum-scale=${scale}`);
doc.documentElement.style.fontSize = `${_baseFontSize / 2 * dpr * _fontscale}px`;
};
使用方法：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no">
<!-- 阿里高清方案 -->
<script>
!function(e){function t(a){if(i[a])return i[a].exports;var n=i[a]={exports:{},id:a,loaded:!1};return e[a].call(n.exports,n,n.exports,t),n.loaded=!0,n.exports}var i={};return t.m=e,t.c=i,t.p="",t(0)}([function(e,t){"use strict";Object.defineProperty(t,"__esModule",{value:!0});var i=window;t["default"]=i.flex=function(e,t){var a=e||100,n=t||1,r=i.document,o=navigator.userAgent,d=o.match(/Android[\S\s]+AppleWebkit\/(\d{3})/i),l=o.match(/U3\/((\d+|\.){5,})/i),c=l&&parseInt(l[1].split(".").join(""),10)>=80,p=navigator.appVersion.match(/(iphone|ipad|ipod)/gi),s=i.devicePixelRatio||1;p||d&&d[1]>534||c||(s=1);var u=1/s,m=r.querySelector('meta[name="viewport"]');m||(m=r.createElement("meta"),m.setAttribute("name","viewport"),r.head.appendChild(m)),m.setAttribute("content","width=device-width,user-scalable=no,initial-scale="+u+",maximum-scale="+u+",minimum-scale="+u),r.documentElement.style.fontSize=a/2*s*n+"px"},e.exports=t["default"]}]);
flex(100, 1);
</script>
</head>
<body>
<!-- 你的代码 -->
</body>
</html>
