flexible.js在华某为手机上使用rem时，页面宽度超出手机屏幕宽度

问题：手机端项目在华为的某款手机上显示时页面内容没有自适应手机宽度，出现横向滚动条

原因：手机获取手机屏幕宽度并计算出rem时出现偏差，明显宽余真实手机屏宽度

解决方案一：在页面里获取页面最外层dom的宽度即html的宽度与手机屏幕的宽度对比，如果两者不等，直接给html的font-size设置成真实手机宽度的rem,解决问题，简单粗暴，但我女朋友不喜欢我简单粗暴，喜欢温柔的，so~

解决方案二：修改flexible.js

改变部分：

// 处理不规则的rem计算
function fixFontSize(width, rem, html)
{ var html= doc.getElementsByTagName('html')[0];
var scale = 1;
var bodyWidth = parseInt(html.offsetWidth);
if (bodyWidth != width) {
scale = width / bodyWidth;
rem = rem * scale; docEl.style.fontSize = rem + 'px';
}
body.style.width = '100%'; }



    function refreshRem(){
        var width = docEl.getBoundingClientRect().width;
var hwidth = doc.docEl?doc.doeEl.clientWidth:doc.body.clientWidth
        if (width / dpr > 540) {
            width = 540 * dpr;
        }
        var rem = width / 10;
        docEl.style.fontSize = rem + 'px';
        flexible.rem = win.rem = rem;
fixFontSize(hwidth,rem)
    }

完整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) {
            // 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);
        }
    }

// 处理不规则的rem计算

function fixFontSize(width, rem, html)

{ var html= doc.getElementsByTagName('html')[0];

var scale = 1;

var bodyWidth = parseInt(html.offsetWidth);

if (bodyWidth != width) {

scale = width / bodyWidth;

rem = rem * scale; docEl.style.fontSize = rem + 'px';

}

body.style.width = '100%'; }

    function refreshRem(){
        var width = docEl.getBoundingClientRect().width;
var hwidth = doc.docEl?doc.doeEl.clientWidth:doc.body.clientWidth
        if (width / dpr > 540) {
            width = 540 * dpr;
        }
        var rem = width / 10;
        docEl.style.fontSize = rem + 'px';
        flexible.rem = win.rem = rem;
fixFontSize(hwidth,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'] = {}));