!(function () {
    var docElem = document.documentElement,
        metaElem = document.querySelector('meta[name="viewport"]'),
        dpr = window.devicePixelRatio || 1,

    // 灏嗛〉闈㈠垎涓?0鍧
        blocks = 10,

    // 闇€瑕侀檺鍒剁殑鏈€灏忓搴
        defaultMinWidth = 300,

    // 闇€瑕侀檺鍒剁殑鏈€澶у搴
        defaultMaxWidth = 640,

    // 璁＄畻鐨勫熀鍑嗗€
        calcMaxWidth = 9999999;

    if (!metaElem) {
        metaElem = initMetaViewport();
    }

    if (metaElem.getAttribute('data-content-max') !== null) {
        calcMaxWidth = defaultMaxWidth;
    }

    // 纭繚meta[name="viewport"]瀛樺湪
    function initMetaViewport() {
        var meta = document.createElement('meta');

        meta.setAttribute('name', 'viewport');
        meta.setAttribute('content', 'width=device-width,initial-scale=1,user-scalable=no');
        document.head.appendChild(meta);

        return meta;
    }

    // 澶ч儴鍒哾pr涓?浠ヤ笅鐨勫畨鍗撴満鍨嬩笉璇嗗埆scale锛岄渶璁剧疆涓嶇缉鏀
    if (navigator.appVersion.match(/android/gi) && dpr < 2) {
        dpr = 1;
        console.log(dpr);
    }

    setScale(dpr);

    // 浼佷笟QQ璁剧疆浜唖cale鍚庯紝涓嶈兘瀹屽叏璇嗗埆scale锛堟鏃禼lientWidth鏈敹鍒扮缉鏀剧殑褰卞搷鑰岀炕鍊嶏級锛岄渶璁剧疆涓嶇缉鏀
    if (navigator.appVersion.match(/qq\//gi) && docElem.clientWidth <= 360) {
        dpr = 1;
        setScale(dpr);
    }

    docElem.setAttribute('data-dpr', dpr);

    // 璁剧疆缂╂斁
    function setScale(dpr) {

        var sale = (1 / dpr);

        //$('.log').append('缂╂斁澶у皬=>' + sale + '<br/>');
        console.log(sale);

        metaElem.setAttribute('content', 'initial-scale=' + sale + ',maximum-scale=' + sale + ',minimum-scale=' + sale + ',user-scalable=no');
    }

    // 璁剧疆docElem瀛椾綋澶у皬
    function setFontSize() {

        //setScale(dpr);

        var clientWidth = docElem.clientWidth;

        console.log(clientWidth);
        $('.log').append('榛樿瀹藉害=>' + clientWidth + '<br/>');

        clientWidth = Math.max(clientWidth, defaultMinWidth * dpr);
        $('.log').append('dpr瀹藉害=>' + clientWidth + '<br/>');

        // 璋冩暣璁＄畻鍩哄噯鍊
        if (calcMaxWidth === defaultMaxWidth) {
            clientWidth = Math.min(clientWidth, defaultMaxWidth * dpr);
        }
        $('.log').append('鏈€缁堝搴?>' + clientWidth + '<br/>');

        var fontsize = clientWidth / blocks + 'px';
        $('.log').append('瀛椾綋澶у皬=>' + fontsize + '<br/>');
        $('.log').append('瀛椾綋澶у皬=>' + metaElem.getAttribute('content') + '<br/>');


        console.log(clientWidth);
        docElem.style.fontSize = fontsize;
    }

    setFontSize();
    if (navigator.appVersion.match(/uc\//gi)) {
        $(document).ready(function () {
            setScale(dpr);
        });
    }

    window.addEventListener(window.orientationchange ? 'orientationchange' : 'resize', setFontSize, false);
})();