text: (function (doc, win) {
  	var docEl = doc.documentElement,
  		resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',
  		recalc = function () {
  
  			var clientWidth = docEl.clientWidth;
  			if (!clientWidth) return;
  			if (clientWidth >= 640) {
  				docEl.style.fontSize = '100px';
  			} else {
  				docEl.style.fontSize = 100 * (clientWidth / 640) + 'px';
  			}
  		};
  
  	if (!doc.addEventListener) return;
  	win.addEventListener(resizeEvt, recalc, false);
  
  	doc.addEventListener('DOMContentLoaded', recalc, false);
  	/*DOMContentLoaded文档加载完成不包含图片资源 onload包含图片资源*/
  })(document, window);
  
  
  /*
  
  var iWidth=document.documentElement.clientWidth  //getBoundingClientRect().width;
   iWidth=iWidth>640?640:iWidth;
   document.getElementsByTagName("html")[0].style.fontSize=iWidth/6.4+"px";*/
  