判断设备是IE，IOS还是Android

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const WIN = window;
const DOC = document;
const UA = window.navigator.userAgent;
// 是否是IE老的版本，现在定义的是IE8
domUtil.isIEOld = (defaultVal, iEOldVal) => {
	if( isIE8() ){
	  return iEOldVal;
	}else{
	  return defaultVal;
	};
};

// 是否是IOS
domUtil.isIOS = /(iPhone|iPad|iPod|iOS)/i.test(UA);

domUtil.isAndroid = /(Android)/i.test(UA);