!function (window) {
    /* 璁捐鍥炬枃妗ｅ搴 */
    var docWidth = 640;
    var doc = window.document,
        docEl = doc.documentElement,
        resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize';
    var recalc = (function refreshRem () {
        /* 绐楀彛褰撳墠瀹藉害 */
        var clientWidth = window.innerWidth;
        /* 椤甸潰瀹藉害澶т簬 璁捐鍥炬枃妗ｅ搴 鏃朵笉鍐嶆斁澶 */
        clientWidth = clientWidth > docWidth ? docWidth : clientWidth;
        var oldSize = (clientWidth/docWidth*100) + 'px';
        docEl.style.fontSize = oldSize;

        /* 鑾峰彇璁剧疆鍚庣殑瀛椾綋澶у皬鎯呭喌 - 鍥犲井淇¤缃瓵PP瀛椾綋澶у皬鍚庝細褰卞搷璇ヨ缃 */
        var nowSize = window.getComputedStyle(document.getElementsByTagName("html")[0]).fontSize;
        var oldSizeValue = parseFloat(oldSize,10);
        var nowSizeValue = parseFloat(nowSize,10);

        /* 褰撳樊鍊煎ぇ浜?鏃堕噸鏂版寜宸瘮璁＄畻鍑烘纭殑px鍊 */
        if((nowSizeValue - oldSizeValue) > 1 || (nowSizeValue - oldSizeValue) < -1){
            var diff = (oldSizeValue / nowSizeValue);
            docEl.style.fontSize = (clientWidth/docWidth*100*diff) + 'px';
        }
        return refreshRem;
    })();
    /* 娣诲姞鍊嶅睆鏍囪瘑锛屽畨鍗撲负1 */
    docEl.setAttribute('data-dpr', window.navigator.appVersion.match(/iphone/gi) ? window.devicePixelRatio : 1);
    if (/iP(hone|od|ad)/.test(window.navigator.userAgent)) {
        /* 娣诲姞IOS鏍囪瘑 */
        doc.documentElement.classList.add('ios');
        /* IOS8浠ヤ笂缁檋tml娣诲姞hairline鏍峰紡锛屼互渚跨壒娈婂鐞 */
        if (parseInt(window.navigator.appVersion.match(/OS (\d+)_(\d+)_?(\d+)?/)[1], 10) >= 8)
            doc.documentElement.classList.add('hairline');
    }
    if (!doc.addEventListener) return;
    window.addEventListener(resizeEvt, recalc, false);
    doc.addEventListener('DOMContentLoaded', recalc, false);
}(window);