[Javascript] UIWebView, WKWebView 구분

# isUIWebView true 이면 UIWebView, false 이면 WKWebView

function isUIWebView(){
	var isInApp = navigator.userAgent.match(/ipod|iphone|ipad/i) && navigator.userAgent.indexOf('Safari') === -1,
    	isUIWebView = false;
	if(isInApp){
    	try {
        	isUIWebView = window.webkit.messageHandlers===undefined?true:false;
        } catch(err) {
        	isUIWebView = true;
        }
    }
	return isUIWebView;
}