;(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 = 0var 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\.]+)/ (match) {
            scale = parseFloat(match[1]);
            dpr = parseInt(1 / scale);
        }
    } else  (flexibleEl) {
        var content = flexibleEl.getAttribute('content' (content) {
            var initialDpr = content.match(/initial\-dpr=([\d\.]+)/);
            var maximumDpr = content.match(/maximum\-dpr=([\d\.]+)/ (initialDpr) {
                dpr = parseFloat(initialDpr[1]);
                scale = parseFloat((1 / dpr).toFixed(2));    
            }
             (maximumDpr) {
                dpr = parseFloat(maximumDpr[1));    
            }
        }
    }

    if (!dpr && !scale) {
        var isAndroid = win.navigator.appVersion.match(/android/gi);
        var isIPhone = win.navigator.appVersion.match(/iphone/var devicePixelRatio = win.devicePixelRatio;
         (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;
            } if (devicePixelRatio >= 2 && (!dpr || dpr >= 2)){
                dpr = 2else {
                dpr = 1;
            }
        }  {
             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' (docEl.firstElementChild) {
            docEl.firstElementChild.appendChild(MetaEl);
        } var wrap = doc.createElement('div');
            wrap.appendChild(MetaEl);
            doc.write(wrap.innerHTML);
        }
    }

     refreshRem(){
        var width = docEl.getBoundingClientRect().width;
        if (width / dpr > 540) {
            width = 540 * dpr;
        }
        var rem = width / 10;
        docEl.style.fontSize = rem + 'px';
        flexible.rem = win.rem = rem;
    }

    win.addEventListener('resize',() {
        clearTimeout(tid);
        tid = setTimeout(refreshRem,300);
    },false);
    win.addEventListener('pageshow',1)">(e) {
         (e.persisted) {
            clearTimeout(tid);
            tid = setTimeout(refreshRem,1)">);
        }
    },1)">);

    if (doc.readyState === 'complete') {
        doc.body.style.fontSize = 12 * dpr + 'px';
    }  {
        doc.addEventListener('DOMContentLoaded',1)">(e) {
            doc.body.style.fontSize = 12 * dpr + 'px';
        },1)">);
    }
    

    refreshRem();

    flexible.dpr = win.dpr = dpr;
    flexible.refreshRem = refreshRem;
    flexible.rem2px = (d) {
        var val = parseFloat(d) * this.rem;
        if (typeof d === 'string' && d.match(/rem$/)) {
            val += 'px';
        }
        return val;
    }
    flexible.px2rem = var val = parseFloat(d) / typeof d === 'string' && d.match(/px$/)) {
            val += 'rem' val;
    }

})(window,window['lib'] || (window['lib'] = {}));