兼容pc和移动端，还兼容了surface平板。
surface平板特别坑，既可以用鼠标也能用触摸屏，也就是说同时有touch事件和mouse事件。
function addEvent(_target,eventType,fnHandler,useCapture){useCapture==undefined?useCapture=true:"";var touchable,isSurface,msPointerable;try{ msPointerable = window.navigator.msPointerEnabled?true:false; }catch(e){ msPointerable=false; }try{ touchable = ("ontouchstart" in document && !isPC()) ? true : false; }catch(e){ touchable=false; }try{ isSurface = ("ontouchstart" in document && isPC()) ? true : false }catch(e){ isSurface=false }var oEventType = null;if(msPointerable){switch(eventType){case "mousedown":eventType="MSPointerDown";break;case "mousemove":eventType="MSPointerMove";break;case "mouseup":eventType="MSPointerUp";break;case "mouseover":eventType="MSPointerOver";break;case "mouseout":eventType="MSPointerOut";break;}}else if(touchable){switch(eventType){case "mousedown":eventType="touchstart";break;case "mousemove":eventType="touchmove";break;case "mouseup":eventType="touchend";break;case "mouseover":eventType="";break;case "mouseout":eventType="";break;}}if(isSurface){switch(eventType){case "mousedown":oEventType="touchstart";break;case "mousemove":oEventType="touchmove";break;case "mouseup":oEventType="touchend";break;case "mouseover":oEventType="";break;case "mouseout":oEventType="";break;}}if(eventType==""){return;}if (_target.addEventListener) {_target.addEventListener(eventType, fnHandler,useCapture);} else if (_target.attachEvent) {_target.attachEvent("on" + eventType, fnHandler);} else {_target["on" + eventType] = fnHandler;}if(!!oEventType){if (_target.addEventListener) {_target.addEventListener(oEventType, fnHandler,useCapture);} else if (_target.attachEvent) {_target.attachEvent("on" + oEventType, fnHandler);} else {_target["on" + oEventType] = fnHandler;}}}function removeEvent(_target, eventType, fnHandler,useCapture){useCapture==undefined?useCapture=true:"";var touchable,isSurface,msPointerable;try{ msPointerable = window.navigator.msPointerEnabled?true:false; }catch(e){ msPointerable=false; }try{ touchable = ("ontouchstart" in document && !isPC()) ? true : false; }catch(e){ touchable=false; }try{ isSurface = ("ontouchstart" in document && isPC()) ? true : false }catch(e){ isSurface=false }var oEventType = null;if(msPointerable){switch(eventType){case "mousedown":eventType="MSPointerDown";break;case "mousemove":eventType="MSPointerMove";break;case "mouseup":eventType="MSPointerUp";break;case "mouseover":eventType="MSPointerOver";break;case "mouseout":eventType="MSPointerOut";break;}}else if(touchable){switch(eventType){case "mousedown":eventType="touchstart";break;case "mousemove":eventType="touchmove";break;case "mouseup":eventType="touchend";break;case "mouseover":eventType="";break;case "mouseout":eventType="";break;}}if(isSurface){switch(eventType){case "mousedown":oEventType="touchstart";break;case "mousemove":oEventType="touchmove";break;case "mouseup":oEventType="touchend";break;case "mouseover":oEventType="";break;case "mouseout":oEventType="";break;}}if (_target.removeEventListener) {_target.removeEventListener(eventType, fnHandler,useCapture);} else if (_target.detachEvent) {_target.detachEvent("on" + eventType, fnHandler);} else {_target["on" + eventType] = null;}if(!!oEventType){if (_target.removeEventListener) {_target.removeEventListener(oEventType, fnHandler,useCapture);} else if (_target.detachEvent) {_target.detachEvent("on" + oEventType, fnHandler);} else {_target["on" + oEventType] = null;}}}function isPC() {var userAgentInfo = navigator.userAgent;var Agents = ["Android", "iPhone","SymbianOS", "Windows Phone","iPad", "iPod"];var flag = true;for (var v = 0; v < Agents.length; v++) {if (userAgentInfo.indexOf(Agents[v]) > 0) {flag = false;break;}}return flag;}
