原生js添加鼠标事件的兼容性写法

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;
}