一 在main.js中引入 flexible.js
vue项目中
import './assets/js/flexible' //vuejquery项目中
<script src="./js/flexible.js"></script>二 flexible.js全部代码如下
(function (win, lib) {var doc = win.documentvar docEl = doc.documentElementvar metaEl = doc.querySelector('meta[name="viewport"]')var flexibleEl = doc.querySelector('meta[name="flexible"]')var dpr = 0var scale = 0var tidvar flexible = lib.flexible || (lib.flexible = {})if (metaEl) {console.warn('将根据已有的meta标签来设置缩放比例')var match = metaEl.getAttribute('content').match(/initial-scale=([\d.]+)/)if (match) {scale = parseFloat(match[1])dpr = parseInt(1 / scale)}} else if (flexibleEl) {var content = flexibleEl.getAttribute('content')if (content) {var initialDpr = content.match(/initial-dpr=([\d.]+)/)var maximumDpr = content.match(/maximum-dpr=([\d.]+)/)if (initialDpr) {dpr = parseFloat(initialDpr[1])scale = parseFloat((1 / dpr).toFixed(2))}if (maximumDpr) {dpr = parseFloat(maximumDpr[1])scale = parseFloat((1 / dpr).toFixed(2))}}}if (!dpr && !scale) {var isAndroid = win.navigator.appVersion.match(/android/gi)var isIPhone = win.navigator.appVersion.match(/iphone/gi)var devicePixelRatio = win.devicePixelRatio// if (isIPhone && !iOS93) {if(isIPhone){// iOS下，对于2和3的屏，用2倍的方案，其余的用1倍方案if (devicePixelRatio >= 3 && (!dpr || dpr >= 3)) {dpr = 3} else if (devicePixelRatio >= 2 && (!dpr || dpr >= 2)) {dpr = 2} else {dpr = 1}} else {// 其他设备下，仍旧使用1倍的方案dpr = 1}scale = 1 / dpr}docEl.setAttribute('data-dpr', dpr)if (!metaEl) {metaEl = doc.createElement('meta')metaEl.setAttribute('name', 'viewport')metaEl.setAttribute('content', 'initial-scale=' + scale + ', maximum-scale=' + scale + ', minimum-scale=' + scale + ', user-scalable=no')if (docEl.firstElementChild) {docEl.firstElementChild.appendChild(metaEl)} else {var wrap = doc.createElement('div')wrap.appendChild(metaEl)doc.write(wrap.innerHTML)}}function refreshRem () {var width = docEl.getBoundingClientRect().widthif (width / dpr > 1024) {width = 1024 * dpr}var rem = width / 3.75docEl.style.fontSize = rem + 'px'flexible.rem = win.rem = rem}win.addEventListener('resize', function () {clearTimeout(tid)tid = setTimeout(refreshRem, 300)}, false)win.addEventListener('pageshow', function (e) {if (e.persisted) {clearTimeout(tid)tid = setTimeout(refreshRem, 300)}}, false)if (doc.readyState === 'complete') {doc.body.style.fontSize = 12 * dpr + 'px'} else {doc.addEventListener('DOMContentLoaded', function (e) {doc.body.style.fontSize = 12 * dpr + 'px'}, false)}refreshRem()flexible.dpr = win.dpr = dprflexible.refreshRem = refreshRemflexible.rem2px = function (d) {var val = parseFloat(d) * this.remif (typeof d === 'string' && d.match(/rem$/)) {val += 'px'}return val}flexible.px2rem = function (d) {var val = parseFloat(d) / this.remif (typeof d === 'string' && d.match(/px$/)) {val += 'rem'}return val}
})(window, window['lib'] || (window['lib'] = {}))