text: function recalc(x,bol) {
  
  	var clientWidth = document.body.clientWidth;
  
  
  
  	if (bol && (!clientWidth || clientWidth > x)) {
  
  		document.documentElement.style.fontSize = "";
  
  		return;
  
  	};
  
  	document.documentElement.style.fontSize = 100 * (clientWidth / x) + 'px';
  
  };
  
  var remCompute = function (width,device) {
  
  	if (window.addEventListener) {
  
  		recalc(width,device);
  
  		var resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize';
  
  		window.addEventListener(resizeEvt, function () {recalc(width,device)}, false);
  
  	};
  
  };
  
  
  
  
  
  // NOTE:
  
  	// htmlҳ��body�µ����Ϸ����뷽��
  
  	// width: Ԥ�����/Ԥ����Ӧ��ʱ��;
  
  	// device:true(pc)   false(mobile)
  
  	// =tureʱ  **pc����Ӧʽʱֻ����С��widthʱ�ż���**
  
  	// =falseʱ  **mobile����ʱ�����м���**
  
  
  
  
  
  // ����: remCompute(640,false);
  
  // ���㷽��: 100px = 1rem; ����20px = 0.2rem;
  
  
  