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!function (window) {
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/* 设计图文档宽度 */
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var docWidth = 750;
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var doc = window.document,
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docEl = doc.documentElement,
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resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize';
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var recalc = (function refreshRem () {
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var clientWidth = docEl.getBoundingClientRect().width;
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if(clientWidth > docWidth){
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docEl.style.fontSize = Math.max(Math.min(20 * (clientWidth / 1536), 22.5), 17.5) * 5 + 'px';
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}else{
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/* 8.55：小于320px不再缩小，11.2：大于420px不再放大 */
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docEl.style.fontSize = Math.max(Math.min(20 * (clientWidth / docWidth), 11.2), 8.55) * 5 + 'px';
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}
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return refreshRem;
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})();
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/* 添加倍屏标识，安卓为1 */
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docEl.setAttribute('data-dpr', window.navigator.appVersion.match(/iphone/gi) ? window.devicePixelRatio : 1);
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if (/iP(hone|od|ad)/.test(window.navigator.userAgent)) {
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/* 添加IOS标识 */
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doc.documentElement.classList.add('ios');
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/* IOS8以上给html添加hairline样式，以便特殊处理 */
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if (parseInt(window.navigator.appVersion.match(/OS (\d+)_(\d+)_?(\d+)?/)[1], 10) >= 8)
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doc.documentElement.classList.add('hairline');
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}
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if (!doc.addEventListener) return;
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window.addEventListener(resizeEvt, recalc, false);
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doc.addEventListener('DOMContentLoaded', recalc, false);
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}(window);
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