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(function () {
    var docEl = document.documentElement;
    var isMobile = window.isMobile /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini|Mobi/i.test(navigator.userAgent);

    function setScale() {
        var pageScale = 1;

        if (window.top !== window) {
            return pageScale;
        }

        var width = docEl.clientWidth || 360;
        var height = docEl.clientHeight || 640;
        if (width / height >= 360 / 640) {
            // 高度優(yōu)先
            pageScale = height / 640;
        } else {
            pageScale = width / 360;
        }

        var content = 'width=' + 360 + ', initial-scale=' + pageScale 
          + ', maximum-scale=' + pageScale + ', user-scalable=no';
        document.getElementById('viewport').setAttribute('content', content);
        window.pageScale = pageScale;
    }
    if (isMobile) {
        setScale();
    } else {
        docEl.className += ' pc';
    }
})()

(function(WIN) {
    var  setFontSize = WIN.setFontSize = function (_width) {
        var  docEl = document.documentElement; 
        // 獲取當(dāng)前窗口的寬度
        var  width = _width || docEl.clientWidth; // docEl.getBoundingClientRect().width;
        // 大于 1080px 按 1080
        if (width > 1080) { 
            width = 1080;
        }
        var  rem = width / 10;
        console.log(rem);
        docEl.style.fontSize = rem + 'px';
       // 部分機(jī)型上的誤差、兼容性處理
        var  actualSize = win.getComputedStyle && parseFloat(win.getComputedStyle(docEl)["font-size"]);
        if (actualSize !== rem && actualSize > 0 && Math.abs(actualSize - rem) > 1) {
            var remScaled = rem * rem / actualSize;
            docEl.style.fontSize = remScaled + 'px';
        }
    }
    var timer;
    //函數(shù)節(jié)流
    function dbcRefresh() {
        clearTimeout(timer);
        timer = setTimeout(setFontSize, 100);
    }
    //窗口更新動(dòng)態(tài)改變 font-size
    WIN.addEventListener('resize', dbcRefresh, false);
    //頁(yè)面顯示時(shí)計(jì)算一次
    WIN.addEventListener('pageshow', function(e) {
        if (e.persisted) { 
            dbcRefresh() 
        }
    }, false);
    setFontSize();
})(window)

function adjustWarp(warpId = '#warp') {
    // if (window.isMobile) return;
    const $win = $(window);
    const height = $win.height();
    let width = $win.width();
    // 考慮導(dǎo)航欄情況
    if (width / height < 360 / 600) {
        return;
    }
    width = Math.ceil(height * 360 / 640);
    $(warpId).css({
        height,
        width,
        postion: 'relative',
        top: 0,
        left: 'auto',
        margin: '0 auto'
    });
    // 重新計(jì)算 rem
    window.setFontSize(width);
}

const px2rem = function(px, rem = 108) {
    let remVal = parseFloat(px) / rem;
    if (typeof px === "string" && px.match(/px$/)) { 
        remVal += 'rem';
    }

    return remVal;
}

.img_demo {
    position: absolute;
    background-size: cover;
    background-image: url('demo.png');
    top: 2.97222rem;
    left: 0.64814rem;
    width: 4.25926rem;
    height: 1.94444rem;
}

// px 轉(zhuǎn) rem
.px2rem(@px, @attr: 'width', @rem: 108rem) {
    @{attr}: (@px / @rem);
}

.px2remTLWH(@top, @left, @width, @height, @rem: 108rem) {
    .px2rem(@top, top, @rem);
    .px2rem(@left, left, @rem);
    .px2rem(@width, width, @rem);
    .px2rem(@height, height, @rem);
}

.img_demo {
    position: absolute;
    background-size: cover;
    background-image: url('demo.png');
    .px2remTLWH(321, 70, 460, 210);
}

// 字體響應(yīng)式
@media screen and (max-width: 321px) {
    body {
        font-size: 13px;
    }
}

@media screen and (min-width: 321px) and (max-width: 400px) {
    body {
        font-size: 14px;
    }
}

@media screen and (min-width: 400px) {
    body {
        font-size: 16px;
    }
}