(function (doc, win) {
	var docEl = doc.documentElement, //文件根標籤
	    resizeEvent = 'orientationchange' in window ? 'orientationchang' : 'resize'; //viewport變化事件源
	var rescale = function () {
	    win.clientWidth = docEl.clientWidth;
	    if (!win.clientWidth) return;
	    // (螢幕寬度/設計圖寬度) = 縮放或擴大的比例值;
	    docEl.style.fontSize = 36 * (win.clientWidth / 375) + 'px';
	}
	if (!doc.addEventListener) return;
	win.addEventListener(resizeEvent, rescale, false);
	doc.addEventListener('DOMContentLoaded', rescale, false);
})(document, window);