关于javascript:vue-大屏适配

flex.js

;(function(win, lib) {    var doc = win.document    var docEl = doc.documentElement    var metaEl = doc.querySelector('meta[name="viewport"]')    var flexibleEl = doc.querySelector('meta[name="flexible"]')    var dpr = 0    var scale = 0    var tid    var flexible = lib.flexible || (lib.flexible = {})    if (metaEl) {        console.warn('将依据已有的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) {            // iOS下，对于2和3的屏，用2倍的计划，其余的用1倍计划            if (devicePixelRatio >= 3 && (!dpr || dpr >= 3)) {                dpr = 3            } else if (devicePixelRatio >= 2 && (!dpr || dpr >= 2)) {                dpr = 2            } else {                dpr = 1            }        } else {            // 其余设施下，仍旧应用1倍的计划            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().width        if (width / dpr < 1366) {            width = 1366 * dpr        } else if (width / dpr > 5760) {            width = 5760 * dpr        }        var rem = width / 10        docEl.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 = dpr    flexible.refreshRem = refreshRem    flexible.rem2px = function(d) {        var val = parseFloat(d) * this.rem        if (typeof d === 'string' && d.match(/rem$/)) {            val += 'px'        }        return val    }    flexible.px2rem = function(d) {        var val = parseFloat(d) / this.rem        if (typeof d === 'string' && d.match(/px$/)) {            val += 'rem'        }        return val    }})(window, window['lib'] || (window['lib'] = {}))

import 'flex.js'